app/Actions/Notifications/BuildProjectNotificationSettingsPayload.php

@@ -2,6 +2,8 @@
 
 namespace App\Actions\Notifications;
 
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Actions\Projects\ResolveProjectTemplateState;
 use App\Enums\DiscordAllowedMentionType;
 use App\Enums\NotificationChannel;
 use App\Enums\NotificationEventType;
@@ -15,6 +17,7 @@ class BuildProjectNotificationSettingsPayload
 {
     public function __construct(
         private readonly ListProjectNotificationActions $listProjectNotificationActions,
+        private readonly ResolveProjectTemplateState $resolveProjectTemplateState,
     ) {}
 
     /**
@@ -33,6 +36,9 @@ class BuildProjectNotificationSettingsPayload
             )->resolve(),
             'project' => ProjectResource::make($project)->resolve(),
             'status' => $status,
+            'templateState' => $this->resolveProjectTemplateState->handle($project, [
+                DuplicateProjectConfiguration::COPY_NOTIFICATION_ACTIONS,
+            ]),
             'templateVariables' => $this->templateVariables(),
         ];
     }

app/Actions/ProjectBoard/UpdateTicketStatusTransitions.php

@@ -2,11 +2,19 @@
 
 namespace App\Actions\ProjectBoard;
 
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Actions\Projects\ProjectTemplateOverrideManager;
+use App\Actions\Projects\RefreshProjectBaseTemplate;
 use App\Models\TicketStatus;
 use Illuminate\Support\Arr;
 
 class UpdateTicketStatusTransitions
 {
+    public function __construct(
+        private readonly ProjectTemplateOverrideManager $projectTemplateOverrideManager,
+        private readonly RefreshProjectBaseTemplate $refreshProjectBaseTemplate,
+    ) {}
+
     /**
      * @param  array{allowed_ticket_status_ids?: array<int, int|string>|null}  $validated
      */
@@ -19,6 +27,14 @@ class UpdateTicketStatusTransitions
             ->all();
 
         $ticketStatus->allowedTargetStatuses()->sync($allowedTicketStatusIds);
+        $this->projectTemplateOverrideManager->mark(
+            $ticketStatus->project,
+            DuplicateProjectConfiguration::COPY_STATUS_TRANSITIONS,
+        );
+        $this->refreshProjectBaseTemplate->handle(
+            $ticketStatus->project,
+            DuplicateProjectConfiguration::COPY_STATUS_TRANSITIONS,
+        );
 
         return $ticketStatus->fresh();
     }

app/Actions/ProjectTicketMetadata/UpdateProjectTicketMetadataSettings.php

@@ -2,11 +2,19 @@
 
 namespace App\Actions\ProjectTicketMetadata;
 
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Actions\Projects\ProjectTemplateOverrideManager;
+use App\Actions\Projects\RefreshProjectBaseTemplate;
 use App\Models\Project;
 use Illuminate\Support\Arr;
 
 class UpdateProjectTicketMetadataSettings
 {
+    public function __construct(
+        private readonly ProjectTemplateOverrideManager $projectTemplateOverrideManager,
+        private readonly RefreshProjectBaseTemplate $refreshProjectBaseTemplate,
+    ) {}
+
     /**
      * @param  array{show_author?: bool|null, show_story_points?: bool|null}  $validated
      */
@@ -16,6 +24,14 @@ class UpdateProjectTicketMetadataSettings
             'show_author' => Arr::get($validated, 'show_author', false),
             'show_story_points' => Arr::get($validated, 'show_story_points', false),
         ]);
+        $this->projectTemplateOverrideManager->mark(
+            $project,
+            DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+        );
+        $this->refreshProjectBaseTemplate->handle(
+            $project,
+            DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+        );
 
         return $project->fresh();
     }

app/Actions/Projects/BuildProjectBoardSettingsPayload.php

@@ -9,6 +9,10 @@ use App\Models\Project;
 
 class BuildProjectBoardSettingsPayload
 {
+    public function __construct(
+        private readonly ResolveProjectTemplateState $resolveProjectTemplateState,
+    ) {}
+
     /**
      * @return array<string, mixed>
      */
@@ -27,6 +31,9 @@ class BuildProjectBoardSettingsPayload
             )->resolve(),
             'project' => ProjectResource::make($project)->resolve(),
             'status' => $status,
+            'templateState' => $this->resolveProjectTemplateState->handle($project, [
+                DuplicateProjectConfiguration::COPY_BOARD_WORKFLOW,
+            ]),
             'ticketStatuses' => TicketStatusResource::collection(
                 $project->ticketStatuses()
                     ->with(['allowedTargetStatuses.boardColumn', 'boardColumn'])

app/Actions/Projects/BuildProjectTicketMetadataSettingsPayload.php

@@ -13,6 +13,10 @@ use App\Models\TicketFieldDefinition;
 
 class BuildProjectTicketMetadataSettingsPayload
 {
+    public function __construct(
+        private readonly ResolveProjectTemplateState $resolveProjectTemplateState,
+    ) {}
+
     /**
      * @return array<string, mixed>
      */
@@ -23,6 +27,13 @@ class BuildProjectTicketMetadataSettingsPayload
             'project' => ProjectResource::make($project)->resolve(),
             'error' => $error,
             'status' => $status,
+            'templateState' => $this->resolveProjectTemplateState->handle($project, [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+                DuplicateProjectConfiguration::COPY_TICKET_PRIORITIES,
+                DuplicateProjectConfiguration::COPY_TICKET_FIELDS,
+                DuplicateProjectConfiguration::COPY_TICKET_LINK_TYPES,
+            ]),
             'ticketFieldDefinitions' => TicketFieldDefinitionResource::collection($project->ticketFieldDefinitions()->get())->resolve(),
             'ticketLinkTypes' => TicketLinkTypeResource::collection($project->ticketLinkTypes()->get())->resolve(),
             'ticketPriorities' => TicketPriorityResource::collection($project->ticketPriorities()->get())->resolve(),

app/Actions/Projects/CreateProject.php

@@ -6,25 +6,85 @@ use App\Actions\Permissions\PermissionService;
 use App\Actions\ProjectTicketMetadata\InitializeProjectTicketMetadata;
 use App\Enums\Permission;
 use App\Models\Project;
+use App\Models\ProjectTemplate;
 use App\Models\User;
+use Illuminate\Support\Arr;
+use Illuminate\Support\Facades\DB;
 
 class CreateProject
 {
     public function __construct(
+        private readonly CreateProjectBaseTemplate $createProjectBaseTemplate,
+        private readonly DuplicateProjectConfiguration $duplicateProjectConfiguration,
         private readonly InitializeProjectTicketMetadata $initializeProjectTicketMetadata,
         private readonly PermissionService $permissionService,
+        private readonly ProjectTemplateOverrideManager $projectTemplateOverrideManager,
     ) {}
 
     /**
-     * @param  array{key: string, name: string}  $attributes
+     * @param  array{key: string, name: string, creation_mode?: string, source_project_id?: int|string|null, source_template_id?: int|string|null, copy_areas?: array<int, string>|null}  $attributes
      */
     public function handle(array $attributes, User $actor): Project
     {
-        $project = Project::query()->create($attributes);
+        return DB::transaction(function () use ($attributes, $actor): Project {
+            $project = Project::query()->create(Arr::only($attributes, ['key', 'name']));
+            $creationMode = Arr::get($attributes, 'creation_mode', 'scratch');
+            $sourceTemplateId = Arr::get($attributes, 'source_template_id');
+            $baseTemplate = null;
+            $sourceTemplate = null;
 
-        $this->initializeProjectTicketMetadata->handle($project);
-        $this->permissionService->grant($actor, Permission::ProjectAdmin, $project);
+            if ($creationMode === 'template' && $sourceTemplateId !== null) {
+                $sourceTemplate = ProjectTemplate::query()
+                    ->published()
+                    ->findOrFail((int) $sourceTemplateId);
 
-        return $project;
+                $project->forceFill([
+                    'project_template_id' => $sourceTemplate->id,
+                    'template_overrides' => [],
+                ])->saveQuietly();
+            } else {
+                $baseTemplate = $this->createProjectBaseTemplate->handle($project);
+
+                $project->forceFill([
+                    'project_template_id' => $baseTemplate->id,
+                    'template_overrides' => [],
+                ])->saveQuietly();
+            }
+
+            $project = $project->fresh() ?? $project;
+
+            $this->projectTemplateOverrideManager->withoutRecording(
+                fn () => $this->initializeProjectTicketMetadata->handle($project),
+            );
+            $this->permissionService->grant($actor, Permission::ProjectAdmin, $project);
+
+            if ($creationMode === 'duplicate' && Arr::get($attributes, 'source_project_id') !== null) {
+                $sourceProject = Project::query()->findOrFail((int) Arr::get($attributes, 'source_project_id'));
+
+                $this->duplicateProjectConfiguration->handle(
+                    $sourceProject,
+                    $project,
+                    array_values(Arr::get($attributes, 'copy_areas', [])),
+                );
+            }
+
+            if ($creationMode === 'template' && $sourceTemplate !== null) {
+                $this->duplicateProjectConfiguration->apply(
+                    $project->fresh() ?? $project,
+                    $sourceTemplate->configuration_snapshot ?? [],
+                );
+            }
+
+            if ($baseTemplate !== null) {
+                $baseTemplate->forceFill([
+                    'configuration_snapshot' => $this->duplicateProjectConfiguration->export(
+                        $project->fresh() ?? $project,
+                        DuplicateProjectConfiguration::copyableAreas(),
+                    ),
+                ])->save();
+            }
+
+            return $project->fresh() ?? $project;
+        });
     }
 }

app/Actions/Projects/CreateProjectBaseTemplate.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Actions\Projects;
+
+use App\Models\Project;
+use App\Models\ProjectTemplate;
+
+class CreateProjectBaseTemplate
+{
+    public function __construct(
+        private readonly DuplicateProjectConfiguration $duplicateProjectConfiguration,
+    ) {}
+
+    public function handle(Project $project): ProjectTemplate
+    {
+        $copyAreas = DuplicateProjectConfiguration::copyableAreas();
+
+        return ProjectTemplate::query()->create([
+            'project_id' => $project->id,
+            'source_project_id' => $project->id,
+            'name' => "{$project->name} base template",
+            'slug' => strtolower($project->key).'-base-template',
+            'is_published' => false,
+            'copy_areas' => $copyAreas,
+            'configuration_snapshot' => $this->duplicateProjectConfiguration->export($project, $copyAreas),
+        ]);
+    }
+}

app/Actions/Projects/CreateProjectTemplate.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Actions\Projects;
+
+use App\Models\Project;
+use App\Models\ProjectTemplate;
+use Illuminate\Support\Arr;
+
+class CreateProjectTemplate
+{
+    public function __construct(
+        private readonly DuplicateProjectConfiguration $duplicateProjectConfiguration,
+    ) {}
+
+    /**
+     * @param  array{name: string, slug: string, copy_areas?: array<int, string>}  $attributes
+     */
+    public function handle(Project $sourceProject, array $attributes): ProjectTemplate
+    {
+        $copyAreas = array_values(Arr::get($attributes, 'copy_areas', []));
+
+        return ProjectTemplate::query()->create([
+            'project_id' => null,
+            'source_project_id' => $sourceProject->id,
+            'name' => $attributes['name'],
+            'slug' => $attributes['slug'],
+            'is_published' => true,
+            'copy_areas' => $this->duplicateProjectConfiguration->normalizeCopyAreas($copyAreas),
+            'configuration_snapshot' => $this->duplicateProjectConfiguration->export($sourceProject, $copyAreas),
+        ]);
+    }
+}

app/Actions/Projects/DuplicateProjectConfiguration.php

@@ -0,0 +1,339 @@
+<?php
+
+namespace App\Actions\Projects;
+
+use App\Models\Project;
+use Illuminate\Database\Eloquent\Collection as EloquentCollection;
+use Illuminate\Database\Eloquent\Model;
+
+class DuplicateProjectConfiguration
+{
+    public const COPY_PROJECT_SETTINGS = 'project_settings';
+
+    public const COPY_BOARD_COLUMNS = 'board_columns';
+
+    public const COPY_TICKET_STATUSES = 'ticket_statuses';
+
+    public const COPY_STATUS_TRANSITIONS = 'status_transitions';
+
+    public const COPY_TICKET_TYPES = 'ticket_types';
+
+    public const COPY_TICKET_PRIORITIES = 'ticket_priorities';
+
+    public const COPY_TICKET_FIELDS = 'ticket_fields';
+
+    public const COPY_TICKET_LINK_TYPES = 'ticket_link_types';
+
+    public const COPY_REPOSITORY_CONNECTIONS = 'repository_connections';
+
+    public const COPY_NOTIFICATION_ACTIONS = 'notification_actions';
+
+    public const COPY_BOARD_WORKFLOW = 'board_workflow';
+
+    public function __construct(
+        private readonly ProjectTemplateOverrideManager $projectTemplateOverrideManager,
+    ) {}
+
+    /** @return list<string> */
+    public static function copyableAreas(): array
+    {
+        return [
+            self::COPY_PROJECT_SETTINGS,
+            self::COPY_BOARD_COLUMNS,
+            self::COPY_TICKET_STATUSES,
+            self::COPY_STATUS_TRANSITIONS,
+            self::COPY_TICKET_TYPES,
+            self::COPY_TICKET_PRIORITIES,
+            self::COPY_TICKET_FIELDS,
+            self::COPY_TICKET_LINK_TYPES,
+            self::COPY_REPOSITORY_CONNECTIONS,
+            self::COPY_NOTIFICATION_ACTIONS,
+        ];
+    }
+
+    /** @return list<string> */
+    public static function acceptedCopyAreas(): array
+    {
+        return [...self::copyableAreas(), self::COPY_BOARD_WORKFLOW];
+    }
+
+    /** @return list<array{value: string, label: string, description: string}> */
+    public static function copyAreaOptions(): array
+    {
+        return [
+            ['value' => self::COPY_PROJECT_SETTINGS, 'label' => 'Project settings', 'description' => 'General project preferences like story points and author visibility.'],
+            ['value' => self::COPY_BOARD_COLUMNS, 'label' => 'Board columns', 'description' => 'Columns and their order on the project board.'],
+            ['value' => self::COPY_TICKET_STATUSES, 'label' => 'Ticket statuses', 'description' => 'Statuses and their assignment to board columns.'],
+            ['value' => self::COPY_STATUS_TRANSITIONS, 'label' => 'Status transitions', 'description' => 'Allowed moves between ticket statuses.'],
+            ['value' => self::COPY_TICKET_TYPES, 'label' => 'Ticket types', 'description' => 'Available ticket types, including parent types.'],
+            ['value' => self::COPY_TICKET_PRIORITIES, 'label' => 'Ticket priorities', 'description' => 'Available ticket priorities.'],
+            ['value' => self::COPY_TICKET_FIELDS, 'label' => 'Custom ticket fields', 'description' => 'Custom field definitions without ticket values.'],
+            ['value' => self::COPY_TICKET_LINK_TYPES, 'label' => 'Ticket link types', 'description' => 'Relationship labels between tickets.'],
+            ['value' => self::COPY_REPOSITORY_CONNECTIONS, 'label' => 'Repository connections', 'description' => 'Repositories linked to the project.'],
+            ['value' => self::COPY_NOTIFICATION_ACTIONS, 'label' => 'Notification actions', 'description' => 'Notification rules and delivery settings.'],
+        ];
+    }
+
+    /** @param list<string> $copyAreas @return list<string> */
+    public function normalizeCopyAreas(array $copyAreas): array
+    {
+        if (in_array(self::COPY_BOARD_WORKFLOW, $copyAreas, true)) {
+            $copyAreas = [
+                ...array_diff($copyAreas, [self::COPY_BOARD_WORKFLOW]),
+                self::COPY_BOARD_COLUMNS,
+                self::COPY_TICKET_STATUSES,
+                self::COPY_STATUS_TRANSITIONS,
+            ];
+        }
+
+        return array_values(array_intersect(self::copyableAreas(), array_unique($copyAreas)));
+    }
+
+    /** @param array<string, mixed> $configuration @return array<string, mixed> */
+    public function normalizeConfiguration(array $configuration): array
+    {
+        $workflow = $configuration[self::COPY_BOARD_WORKFLOW] ?? null;
+
+        if (is_array($workflow)) {
+            $statuses = $workflow['ticket_statuses'] ?? [];
+            $configuration[self::COPY_BOARD_COLUMNS] ??= $workflow['board_columns'] ?? [];
+            $configuration[self::COPY_TICKET_STATUSES] ??= array_map(
+                static fn (array $status): array => array_diff_key($status, ['allowed_target_indexes' => true]),
+                $statuses,
+            );
+            $configuration[self::COPY_STATUS_TRANSITIONS] ??= array_map(
+                static fn (array $status): array => $status['allowed_target_indexes'] ?? [],
+                $statuses,
+            );
+            unset($configuration[self::COPY_BOARD_WORKFLOW]);
+        }
+
+        return $configuration;
+    }
+
+    /** @param list<string> $copyAreas @return array<string, mixed> */
+    public function export(Project $sourceProject, array $copyAreas): array
+    {
+        $selectedAreas = $this->normalizeCopyAreas($copyAreas);
+
+        if ($selectedAreas === []) {
+            return [];
+        }
+
+        $sourceProject->load([
+            'boardColumns', 'notificationActions', 'repositoryConnections', 'ticketFieldDefinitions',
+            'ticketLinkTypes', 'ticketPriorities', 'ticketStatuses.allowedTargetStatuses', 'ticketTypes',
+        ]);
+        $configuration = [];
+
+        if (in_array(self::COPY_PROJECT_SETTINGS, $selectedAreas, true)) {
+            $configuration[self::COPY_PROJECT_SETTINGS] = [
+                'show_author' => $sourceProject->show_author,
+                'show_story_points' => $sourceProject->show_story_points,
+            ];
+        }
+
+        $columnIndexes = $sourceProject->boardColumns->values()->mapWithKeys(
+            static fn ($column, int $index): array => [$column->id => $index],
+        );
+        $statusIndexes = $sourceProject->ticketStatuses->values()->mapWithKeys(
+            static fn ($status, int $index): array => [$status->id => $index],
+        );
+
+        if (in_array(self::COPY_BOARD_COLUMNS, $selectedAreas, true)) {
+            $configuration[self::COPY_BOARD_COLUMNS] = $sourceProject->boardColumns->values()->map(
+                static fn ($column): array => ['name' => $column->name, 'position' => $column->position],
+            )->all();
+        }
+
+        if (in_array(self::COPY_TICKET_STATUSES, $selectedAreas, true)) {
+            $configuration[self::COPY_TICKET_STATUSES] = $sourceProject->ticketStatuses->values()->map(
+                static fn ($status): array => [
+                    'board_column_index' => $status->board_column_id === null ? null : $columnIndexes->get($status->board_column_id),
+                    'name' => $status->name,
+                    'position' => $status->position,
+                ],
+            )->all();
+        }
+
+        if (in_array(self::COPY_STATUS_TRANSITIONS, $selectedAreas, true)) {
+            $configuration[self::COPY_STATUS_TRANSITIONS] = $sourceProject->ticketStatuses->values()->map(
+                static fn ($status): array => $status->allowedTargetStatuses->pluck('id')->map(
+                    static fn (int $id): ?int => $statusIndexes->get($id),
+                )->filter(static fn (?int $index): bool => $index !== null)->values()->all(),
+            )->all();
+        }
+
+        $simpleAreas = [
+            self::COPY_TICKET_TYPES => fn ($item): array => ['name' => $item->name, 'position' => $item->position, 'is_parent' => $item->is_parent],
+            self::COPY_TICKET_PRIORITIES => fn ($item): array => ['name' => $item->name, 'position' => $item->position],
+            self::COPY_TICKET_FIELDS => fn ($item): array => ['field_type' => $item->field_type, 'label' => $item->label, 'position' => $item->position],
+            self::COPY_TICKET_LINK_TYPES => fn ($item): array => ['label' => $item->label, 'counterpart_label' => $item->counterpart_label, 'position' => $item->position],
+            self::COPY_REPOSITORY_CONNECTIONS => fn ($item): array => [
+                'provider' => $item->provider->value, 'base_url' => $item->base_url,
+                'provider_repository_id' => $item->provider_repository_id, 'owner_name' => $item->owner_name,
+                'repository_name' => $item->repository_name, 'repository_full_name' => $item->repository_full_name,
+                'repository_url' => $item->repository_url,
+            ],
+            self::COPY_NOTIFICATION_ACTIONS => fn ($item): array => [
+                'name' => $item->name, 'enabled' => $item->enabled, 'event_type' => $item->event_type->value,
+                'channel' => $item->channel->value, 'channel_configuration' => $item->channel_configuration ?? [],
+                'message_template' => $item->message_template, 'delivery_url' => $item->delivery_url,
+                'filters' => $item->filters ?? [],
+            ],
+        ];
+        $relations = [
+            self::COPY_TICKET_TYPES => 'ticketTypes', self::COPY_TICKET_PRIORITIES => 'ticketPriorities',
+            self::COPY_TICKET_FIELDS => 'ticketFieldDefinitions', self::COPY_TICKET_LINK_TYPES => 'ticketLinkTypes',
+            self::COPY_REPOSITORY_CONNECTIONS => 'repositoryConnections', self::COPY_NOTIFICATION_ACTIONS => 'notificationActions',
+        ];
+
+        foreach ($simpleAreas as $area => $mapper) {
+            if (in_array($area, $selectedAreas, true)) {
+                $configuration[$area] = $sourceProject->{$relations[$area]}->values()->map($mapper)->all();
+            }
+        }
+
+        return $configuration;
+    }
+
+    /**
+     * @param  array<string, mixed>  $configuration
+     * @param  array<int|string, int|string>  $statusReplacements
+     * @return list<string> areas which retained referenced local values
+     */
+    public function apply(Project $targetProject, array $configuration, array $statusReplacements = []): array
+    {
+        $configuration = $this->normalizeConfiguration($configuration);
+
+        $blockedAreas = $this->projectTemplateOverrideManager->withoutRecording(function () use ($targetProject, $configuration, $statusReplacements): array {
+            $blockedAreas = [];
+
+            if (isset($configuration[self::COPY_PROJECT_SETTINGS])) {
+                $targetProject->forceFill($configuration[self::COPY_PROJECT_SETTINGS])->saveQuietly();
+            }
+
+            if (isset($configuration[self::COPY_BOARD_COLUMNS])) {
+                $blocked = $this->syncModels(
+                    $targetProject->boardColumns()->get(),
+                    $configuration[self::COPY_BOARD_COLUMNS],
+                    fn (array $item) => $targetProject->boardColumns()->create($item),
+                    static fn (Model $model, array $item) => $model->forceFill($item)->saveQuietly(),
+                    static fn (Model $column): bool => ! $column->ticketStatuses()->exists(),
+                );
+                if ($blocked) {
+                    $blockedAreas[] = self::COPY_BOARD_COLUMNS;
+                }
+            }
+
+            if (isset($configuration[self::COPY_TICKET_STATUSES])) {
+                $columns = $targetProject->boardColumns()->get()->values();
+                $items = collect($configuration[self::COPY_TICKET_STATUSES])->map(static function (array $item) use ($columns): array {
+                    $columnIndex = $item['board_column_index'] ?? null;
+                    $item['board_column_id'] = $columnIndex === null ? null : $columns->get($columnIndex)?->id;
+                    unset($item['board_column_index']);
+
+                    return $item;
+                })->all();
+                $blocked = $this->syncModels(
+                    $targetProject->ticketStatuses()->get(),
+                    $items,
+                    fn (array $item) => $targetProject->ticketStatuses()->create($item),
+                    static fn (Model $model, array $item) => $model->forceFill($item)->saveQuietly(),
+                    function (Model $status) use ($statusReplacements): bool {
+                        if (! $status->tickets()->exists()) {
+                            return true;
+                        }
+                        $replacementId = $statusReplacements[$status->id] ?? null;
+                        if ($replacementId === null) {
+                            return false;
+                        }
+                        $status->tickets()->update(['ticket_status_id' => $replacementId]);
+
+                        return true;
+                    },
+                );
+                if ($blocked) {
+                    $blockedAreas[] = self::COPY_TICKET_STATUSES;
+                }
+            }
+
+            if (isset($configuration[self::COPY_STATUS_TRANSITIONS])) {
+                $statuses = $targetProject->ticketStatuses()->get()->values();
+                foreach ($configuration[self::COPY_STATUS_TRANSITIONS] as $index => $targets) {
+                    $status = $statuses->get($index);
+                    if ($status !== null) {
+                        $status->allowedTargetStatuses()->sync(collect($targets)->map(fn (int $target): ?int => $statuses->get($target)?->id)->filter()->all());
+                    }
+                }
+            }
+
+            $relations = [
+                self::COPY_TICKET_TYPES => ['ticketTypes', fn (Model $item): bool => ! $item->tickets()->exists()],
+                self::COPY_TICKET_PRIORITIES => ['ticketPriorities', fn (Model $item): bool => ! $item->tickets()->exists()],
+                self::COPY_TICKET_FIELDS => ['ticketFieldDefinitions', fn (Model $item): bool => ! $item->ticketFieldValues()->exists()],
+                self::COPY_TICKET_LINK_TYPES => ['ticketLinkTypes', fn (Model $item): bool => ! $item->ticketLinks()->exists()],
+                self::COPY_REPOSITORY_CONNECTIONS => ['repositoryConnections', null],
+                self::COPY_NOTIFICATION_ACTIONS => ['notificationActions', null],
+            ];
+
+            foreach ($relations as $area => [$relation, $canDelete]) {
+                if (! isset($configuration[$area])) {
+                    continue;
+                }
+                $blocked = $this->syncModels(
+                    $targetProject->{$relation}()->get(),
+                    $configuration[$area],
+                    fn (array $item) => $targetProject->{$relation}()->create($item),
+                    static fn (Model $model, array $item) => $model->forceFill($item)->saveQuietly(),
+                    $canDelete,
+                );
+                if ($blocked) {
+                    $blockedAreas[] = $area;
+                }
+            }
+
+            foreach ($targetProject->configurationRelations() as $relation) {
+                $targetProject->{$relation}()->update(['project_template_id' => $targetProject->project_template_id]);
+            }
+
+            return array_values(array_unique($blockedAreas));
+        });
+
+        foreach ($blockedAreas as $area) {
+            $this->projectTemplateOverrideManager->mark($targetProject->fresh(), $area);
+        }
+
+        return $blockedAreas;
+    }
+
+    /** @param list<string> $copyAreas */
+    public function handle(Project $sourceProject, Project $targetProject, array $copyAreas): void
+    {
+        $this->apply($targetProject, $this->export($sourceProject, $copyAreas));
+    }
+
+    /**
+     * @param  EloquentCollection<int, Model>  $models
+     * @param  array<int, array<string, mixed>>  $items
+     */
+    private function syncModels(EloquentCollection $models, array $items, callable $create, callable $update, ?callable $canDelete = null): bool
+    {
+        foreach ($items as $index => $item) {
+            $model = $models->get($index);
+            $model === null ? $create($item) : $update($model, $item);
+        }
+
+        $blocked = false;
+        foreach ($models->slice(count($items)) as $model) {
+            if ($canDelete !== null && ! $canDelete($model)) {
+                $blocked = true;
+
+                continue;
+            }
+            $model->deleteQuietly();
+        }
+
+        return $blocked;
+    }
+}

app/Actions/Projects/ProjectTemplateOverrideManager.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace App\Actions\Projects;
+
+use App\Models\Project;
+
+class ProjectTemplateOverrideManager
+{
+    private static int $suppressionDepth = 0;
+
+    public function mark(Project $project, string $area): void
+    {
+        if (self::$suppressionDepth > 0) {
+            return;
+        }
+
+        $project->loadMissing('projectTemplate');
+
+        if ($project->projectTemplate === null || ! $project->projectTemplate->is_published) {
+            return;
+        }
+
+        $overrides = array_values(array_unique([
+            ...($project->template_overrides ?? []),
+            $area,
+        ]));
+
+        $project->forceFill(['template_overrides' => $overrides])->saveQuietly();
+    }
+
+    /**
+     * @param  list<string>  $areas
+     */
+    public function clear(Project $project, array $areas): void
+    {
+        $remaining = array_values(array_diff($project->template_overrides ?? [], $areas));
+        $project->forceFill(['template_overrides' => $remaining])->saveQuietly();
+    }
+
+    public function withoutRecording(callable $callback): mixed
+    {
+        self::$suppressionDepth++;
+
+        try {
+            return $callback();
+        } finally {
+            self::$suppressionDepth--;
+        }
+    }
+
+    public function isRecording(): bool
+    {
+        return self::$suppressionDepth === 0;
+    }
+}

app/Actions/Projects/RefreshProjectBaseTemplate.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Actions\Projects;
+
+use App\Models\Project;
+
+class RefreshProjectBaseTemplate
+{
+    public function __construct(
+        private readonly DuplicateProjectConfiguration $duplicateProjectConfiguration,
+    ) {}
+
+    public function handle(Project $project, string $area): void
+    {
+        $project->loadMissing('projectTemplate');
+
+        if ($project->projectTemplate === null || $project->projectTemplate->is_published) {
+            return;
+        }
+
+        $snapshot = $this->duplicateProjectConfiguration->normalizeConfiguration(
+            $project->projectTemplate->configuration_snapshot ?? [],
+        );
+
+        $project->projectTemplate->forceFill([
+            'configuration_snapshot' => array_replace(
+                $snapshot,
+                $this->duplicateProjectConfiguration->export($project->fresh(), [$area]),
+            ),
+        ])->saveQuietly();
+    }
+}

app/Actions/Projects/ResolveProjectTemplateState.php

@@ -0,0 +1,136 @@
+<?php
+
+namespace App\Actions\Projects;
+
+use App\Models\Project;
+use App\Models\ProjectTemplate;
+
+class ResolveProjectTemplateState
+{
+    public function __construct(
+        private readonly DuplicateProjectConfiguration $duplicateProjectConfiguration,
+    ) {}
+
+    /**
+     * @param  list<string>|null  $areas
+     * @return array<string, mixed>|null
+     */
+    public function handle(Project $project, ?array $areas = null): ?array
+    {
+        $project->loadMissing('projectTemplate');
+
+        /** @var ProjectTemplate|null $projectTemplate */
+        $projectTemplate = $project->projectTemplate;
+
+        if ($projectTemplate === null) {
+            return null;
+        }
+
+        $selectedAreas = $areas === null
+            ? DuplicateProjectConfiguration::copyableAreas()
+            : $this->duplicateProjectConfiguration->normalizeCopyAreas($areas);
+
+        $normalizedTemplateConfiguration = $this->duplicateProjectConfiguration->normalizeConfiguration(
+            $projectTemplate->configuration_snapshot ?? [],
+        );
+        $templateConfiguration = collect($normalizedTemplateConfiguration)
+            ->only($selectedAreas)
+            ->all();
+        $currentConfiguration = $this->duplicateProjectConfiguration->export($project, $selectedAreas);
+        $persistedOverrides = $projectTemplate->is_published
+            ? array_values(array_intersect($project->template_overrides ?? [], $selectedAreas))
+            : [];
+
+        $overriddenAreas = [];
+        $inheritedAreas = [];
+
+        foreach ($selectedAreas as $area) {
+            $label = $this->labelForArea($area);
+            $hasTemplateValue = array_key_exists($area, $templateConfiguration);
+
+            if (! $hasTemplateValue) {
+                continue;
+            }
+
+            if (! in_array($area, $persistedOverrides, true)) {
+                $inheritedAreas[] = [
+                    'label' => $label,
+                    'value' => $area,
+                ];
+
+                continue;
+            }
+
+            $overriddenAreas[] = [
+                'label' => $label,
+                'value' => $area,
+            ];
+        }
+
+        $overriddenAreaValues = array_flip(array_column($overriddenAreas, 'value'));
+        $inheritedAreaValues = array_flip(array_column($inheritedAreas, 'value'));
+
+        return [
+            'effectiveConfiguration' => array_replace($templateConfiguration, array_intersect_key($currentConfiguration, $overriddenAreaValues)),
+            'inheritedAreas' => $inheritedAreas,
+            'inheritedConfiguration' => array_intersect_key($templateConfiguration, $inheritedAreaValues),
+            'inheritsFromTemplate' => $projectTemplate->is_published,
+            'overriddenAreas' => $overriddenAreas,
+            'overriddenConfiguration' => array_intersect_key($currentConfiguration, $overriddenAreaValues),
+            'resetRequirements' => $this->resetRequirements($project, $templateConfiguration, $persistedOverrides),
+            'templateConfiguration' => $templateConfiguration,
+            'templateId' => $projectTemplate->id,
+            'templateName' => $projectTemplate->name,
+            'templateSlug' => $projectTemplate->slug,
+        ];
+    }
+
+    /**
+     * @param  array<string, mixed>  $templateConfiguration
+     * @param  list<string>  $persistedOverrides
+     * @return array<string, mixed>
+     */
+    private function resetRequirements(Project $project, array $templateConfiguration, array $persistedOverrides): array
+    {
+        if (! in_array(DuplicateProjectConfiguration::COPY_TICKET_STATUSES, $persistedOverrides, true)) {
+            return [];
+        }
+
+        $templateStatuses = $templateConfiguration[DuplicateProjectConfiguration::COPY_TICKET_STATUSES] ?? [];
+        if (! is_array($templateStatuses)) {
+            return [];
+        }
+
+        $statuses = $project->ticketStatuses()->withCount('tickets')->get()->values();
+        $replacementOptions = $statuses->take(count($templateStatuses))->map(
+            static fn ($status): array => ['id' => $status->id, 'name' => $status->name],
+        )->all();
+        $removedStatuses = $statuses->slice(count($templateStatuses))
+            ->filter(static fn ($status): bool => $status->tickets_count > 0)
+            ->map(static fn ($status): array => [
+                'id' => $status->id,
+                'name' => $status->name,
+                'ticketCount' => $status->tickets_count,
+            ])
+            ->values()
+            ->all();
+
+        return $removedStatuses === [] ? [] : [
+            DuplicateProjectConfiguration::COPY_TICKET_STATUSES => [
+                'removedStatuses' => $removedStatuses,
+                'replacementOptions' => $replacementOptions,
+            ],
+        ];
+    }
+
+    private function labelForArea(string $area): string
+    {
+        foreach (DuplicateProjectConfiguration::copyAreaOptions() as $option) {
+            if ($option['value'] === $area) {
+                return $option['label'];
+            }
+        }
+
+        return $area;
+    }
+}

app/Actions/Projects/UpdateProjectTemplate.php

@@ -0,0 +1,88 @@
+<?php
+
+namespace App\Actions\Projects;
+
+use App\Models\Project;
+use App\Models\ProjectTemplate;
+use Illuminate\Support\Arr;
+use Illuminate\Support\Facades\DB;
+
+class UpdateProjectTemplate
+{
+    public function __construct(
+        private readonly DuplicateProjectConfiguration $duplicateProjectConfiguration,
+        private readonly ProjectTemplateOverrideManager $projectTemplateOverrideManager,
+    ) {}
+
+    /**
+     * @param  array{name: string, copy_areas?: array<int, string>}  $attributes
+     */
+    public function handle(ProjectTemplate $projectTemplate, array $attributes): ProjectTemplate
+    {
+        $projectTemplate->loadMissing('sourceProject');
+
+        $sourceProject = $projectTemplate->sourceProject;
+        abort_if($sourceProject === null, 422, 'This template cannot be edited because the source project is missing.');
+
+        $copyAreas = array_values(Arr::get($attributes, 'copy_areas', []));
+        $normalizedCopyAreas = $this->duplicateProjectConfiguration->normalizeCopyAreas($copyAreas);
+        $previousConfiguration = $this->duplicateProjectConfiguration->normalizeConfiguration(
+            $projectTemplate->configuration_snapshot ?? [],
+        );
+        $nextConfiguration = $this->duplicateProjectConfiguration->export($sourceProject, $normalizedCopyAreas);
+        $affectedAreas = collect(array_unique([...array_keys($previousConfiguration), ...array_keys($nextConfiguration)]))
+            ->filter(fn (string $area): bool => ($previousConfiguration[$area] ?? null) !== ($nextConfiguration[$area] ?? null))
+            ->values()
+            ->all();
+
+        DB::transaction(function () use ($projectTemplate, $attributes, $normalizedCopyAreas, $nextConfiguration, $previousConfiguration, $affectedAreas): void {
+            ProjectTemplate::query()->whereKey($projectTemplate->id)->lockForUpdate()->firstOrFail();
+
+            $projectTemplate->forceFill([
+                'name' => $attributes['name'],
+                'copy_areas' => $normalizedCopyAreas,
+                'configuration_snapshot' => $nextConfiguration,
+            ])->save();
+
+            Project::query()
+                ->where('project_template_id', $projectTemplate->id)
+                ->orderBy('id')
+                ->chunkById(100, function ($linkedProjects) use ($affectedAreas, $nextConfiguration, $previousConfiguration): void {
+                    foreach ($linkedProjects as $linkedProject) {
+                        $linkedProject = Project::query()->whereKey($linkedProject->id)->lockForUpdate()->firstOrFail();
+                        $currentConfiguration = $this->duplicateProjectConfiguration->export($linkedProject, $affectedAreas);
+                        $overrides = $linkedProject->template_overrides ?? [];
+                        $replacementConfiguration = [];
+
+                        foreach ($affectedAreas as $area) {
+                            if (in_array($area, $overrides, true)) {
+                                continue;
+                            }
+
+                            if (! array_key_exists($area, $nextConfiguration)) {
+                                $this->projectTemplateOverrideManager->mark($linkedProject, $area);
+
+                                continue;
+                            }
+
+                            if (! array_key_exists($area, $previousConfiguration)
+                                && array_key_exists($area, $currentConfiguration)
+                                && $currentConfiguration[$area] !== []) {
+                                $this->projectTemplateOverrideManager->mark($linkedProject, $area);
+
+                                continue;
+                            }
+
+                            $replacementConfiguration[$area] = $nextConfiguration[$area];
+                        }
+
+                        if ($replacementConfiguration !== []) {
+                            $this->duplicateProjectConfiguration->apply($linkedProject, $replacementConfiguration);
+                        }
+                    }
+                });
+        });
+
+        return $projectTemplate->fresh(['sourceProject'])->loadCount('linkedProjects');
+    }
+}

app/Actions/Projects/UpdateProjectTemplateLink.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace App\Actions\Projects;
+
+use App\Models\Project;
+use App\Models\ProjectTemplate;
+use Illuminate\Support\Facades\DB;
+
+class UpdateProjectTemplateLink
+{
+    public function __construct(
+        private readonly DuplicateProjectConfiguration $duplicateProjectConfiguration,
+        private readonly ProjectTemplateOverrideManager $projectTemplateOverrideManager,
+    ) {}
+
+    public function switch(Project $project, ProjectTemplate $template): void
+    {
+        DB::transaction(function () use ($project, $template): void {
+            $project = Project::query()->whereKey($project->id)->lockForUpdate()->firstOrFail();
+            $configuration = $this->duplicateProjectConfiguration->normalizeConfiguration(
+                $template->configuration_snapshot ?? [],
+            );
+            $localAreas = array_values(array_diff(
+                DuplicateProjectConfiguration::copyableAreas(),
+                array_keys($configuration),
+            ));
+
+            $project->forceFill([
+                'project_template_id' => $template->id,
+                'template_overrides' => $localAreas,
+            ])->saveQuietly();
+
+            $blockedAreas = $this->duplicateProjectConfiguration->apply($project, $configuration);
+            $this->projectTemplateOverrideManager->clear(
+                $project->fresh(),
+                array_values(array_diff(array_keys($configuration), $blockedAreas)),
+            );
+        });
+    }
+
+    /**
+     * @param  list<string>  $areas
+     * @param  array<int|string, int|string>  $statusReplacements
+     */
+    public function reset(Project $project, array $areas, array $statusReplacements = []): void
+    {
+        $template = $project->projectTemplate;
+
+        if ($template === null) {
+            return;
+        }
+
+        DB::transaction(function () use ($project, $template, $areas, $statusReplacements): void {
+            $project = Project::query()->whereKey($project->id)->lockForUpdate()->firstOrFail();
+            $configuration = collect($this->duplicateProjectConfiguration->normalizeConfiguration(
+                $template->configuration_snapshot ?? [],
+            ))->only($areas)->all();
+            $blockedAreas = $this->duplicateProjectConfiguration->apply(
+                $project,
+                $configuration,
+                $statusReplacements,
+            );
+            $this->projectTemplateOverrideManager->clear(
+                $project->fresh(),
+                array_values(array_diff(array_keys($configuration), $blockedAreas)),
+            );
+        });
+    }
+}

app/Actions/Repositories/BuildProjectRepositorySettingsPayload.php

@@ -4,6 +4,8 @@ namespace App\Actions\Repositories;
 
 use App\Actions\Git\Data\GitRepository;
 use App\Actions\Git\GitProviderManager;
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Actions\Projects\ResolveProjectTemplateState;
 use App\Http\Resources\AvailableGitRepositorySourceResource;
 use App\Http\Resources\ProjectResource;
 use App\Http\Resources\RepositoryConnectionResource;
@@ -18,6 +20,7 @@ class BuildProjectRepositorySettingsPayload
 {
     public function __construct(
         private readonly GitProviderManager $gitProviderManager,
+        private readonly ResolveProjectTemplateState $resolveProjectTemplateState,
     ) {}
 
     /**
@@ -41,6 +44,9 @@ class BuildProjectRepositorySettingsPayload
             'project' => ProjectResource::make($project)->resolve(),
             'repositoryConnections' => RepositoryConnectionResource::collection($repositoryConnections)->resolve(),
             'status' => $status,
+            'templateState' => $this->resolveProjectTemplateState->handle($project, [
+                DuplicateProjectConfiguration::COPY_REPOSITORY_CONNECTIONS,
+            ]),
         ];
     }
 

app/Actions/Tickets/CreateProjectTicket.php

@@ -47,9 +47,9 @@ class CreateProjectTicket
             $nextSequenceNumber = (int) Ticket::query()
                 ->where('project_id', $project->id)
                 ->max('sequence_number') + 1;
-            $ticketStatus = TicketStatus::query()
-                ->where('project_id', $project->id)
-                ->findOrFail(Arr::get($attributes, 'ticket_status_id'));
+            $ticketStatusQuery = TicketStatus::query()->where('project_id', $project->id);
+
+            $ticketStatus = $ticketStatusQuery->findOrFail(Arr::get($attributes, 'ticket_status_id'));
 
             $ticket = Ticket::query()->create([
                 'assignee_user_id' => Arr::get($attributes, 'assignee_user_id'),

app/Http/Controllers/ProjectController.php

@@ -6,16 +6,23 @@ use App\Actions\Permissions\PermissionService;
 use App\Actions\Projects\BuildProjectBacklogPayload;
 use App\Actions\Projects\CreateProject;
 use App\Actions\Projects\DeleteProject;
+use App\Actions\Projects\DuplicateProjectConfiguration;
 use App\Actions\Projects\ListVisibleProjects;
+use App\Actions\Projects\ResolveProjectTemplateState;
+use App\Actions\Projects\UpdateProjectTemplateLink;
 use App\Enums\Permission;
 use App\Http\Requests\DeleteProjectRequest;
+use App\Http\Requests\ResetProjectTemplateRequest;
 use App\Http\Requests\StoreProjectRequest;
+use App\Http\Requests\SwitchProjectTemplateRequest;
 use App\Http\Requests\SyncProjectPermissionsRequest;
 use App\Http\Resources\PermissionOptionResource;
 use App\Http\Resources\ProjectResource;
+use App\Http\Resources\ProjectTemplateResource;
 use App\Http\Resources\TeamResource;
 use App\Http\Resources\UserResource;
 use App\Models\Project;
+use App\Models\ProjectTemplate;
 use App\Models\Team;
 use App\Models\User;
 use Illuminate\Http\RedirectResponse;
@@ -30,8 +37,11 @@ class ProjectController extends Controller
         private readonly BuildProjectBacklogPayload $buildProjectBacklogPayload,
         private readonly CreateProject $createProject,
         private readonly DeleteProject $deleteProject,
+        private readonly DuplicateProjectConfiguration $duplicateProjectConfiguration,
         private readonly ListVisibleProjects $listVisibleProjects,
         private readonly PermissionService $permissionService,
+        private readonly ResolveProjectTemplateState $resolveProjectTemplateState,
+        private readonly UpdateProjectTemplateLink $updateProjectTemplateLink,
     ) {}
 
     public function index(Request $request): Response
@@ -51,7 +61,23 @@ class ProjectController extends Controller
             403,
         );
 
-        return Inertia::render('projects/Create');
+        $sourceTemplates = ProjectTemplate::query()
+            ->published()
+            ->with('sourceProject')
+            ->orderBy('name')
+            ->get();
+        $selectedTemplateId = $request->integer('template');
+
+        return Inertia::render('projects/Create', [
+            'copyAreaOptions' => DuplicateProjectConfiguration::copyAreaOptions(),
+            'sourceProjects' => ProjectResource::collection(
+                $this->listVisibleProjects->handle($request->user()),
+            )->resolve(),
+            'sourceTemplates' => ProjectTemplateResource::collection($sourceTemplates)->resolve(),
+            'selectedSourceTemplateId' => $sourceTemplates->contains('id', $selectedTemplateId)
+                ? $selectedTemplateId
+                : null,
+        ]);
     }
 
     public function store(StoreProjectRequest $request): RedirectResponse
@@ -73,6 +99,7 @@ class ProjectController extends Controller
         return Inertia::render('projects/Show', [
             'canManageAccess' => $this->permissionService->allows($user, Permission::ProjectAdmin, $project),
             'project' => ProjectResource::make($project)->resolve(),
+            'templateState' => $this->resolveProjectTemplateState->handle($project),
         ]);
     }
 
@@ -95,10 +122,58 @@ class ProjectController extends Controller
     {
         return Inertia::render('projects/settings/General', [
             'project' => ProjectResource::make($project)->resolve(),
+            'sourceTemplates' => ProjectTemplateResource::collection(
+                ProjectTemplate::query()
+                    ->published()
+                    ->with('sourceProject')
+                    ->orderBy('name')
+                    ->get(),
+            )->resolve(),
             'status' => session('status'),
+            'templateState' => $this->resolveProjectTemplateState->handle($project),
         ]);
     }
 
+    public function switchTemplate(SwitchProjectTemplateRequest $request, Project $project): RedirectResponse
+    {
+        $validated = $request->validated();
+        $template = ProjectTemplate::query()
+            ->published()
+            ->findOrFail((int) Arr::get($validated, 'source_template_id'));
+
+        $this->updateProjectTemplateLink->switch($project, $template);
+
+        return to_route('projects.settings.general', $project)
+            ->with('status', "{$project->name} now uses the {$template->name} template.");
+    }
+
+    public function resetTemplate(ResetProjectTemplateRequest $request, Project $project): RedirectResponse
+    {
+        $validated = $request->validated();
+
+        $template = $project->projectTemplate;
+
+        abort_if($template === null, 422, 'This project has no linked template to reset.');
+
+        $configuration = $this->duplicateProjectConfiguration->normalizeConfiguration(
+            $template->configuration_snapshot ?? [],
+        );
+        $areas = array_values(Arr::get($validated, 'areas', array_keys($configuration)));
+        $statusReplacements = Arr::get($validated, 'status_replacements', []);
+
+        $this->updateProjectTemplateLink->reset(
+            $project->load('projectTemplate'),
+            $areas,
+            $statusReplacements,
+        );
+
+        $status = Arr::has($validated, 'areas')
+            ? "Selected settings were reset to the {$template->name} template."
+            : "{$project->name} was reset to the {$template->name} template baseline.";
+
+        return back()->with('status', $status);
+    }
+
     public function access(Request $request, Project $project): Response
     {
         $user = $request->user();

app/Http/Controllers/ProjectTemplateController.php

@@ -0,0 +1,89 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Actions\Projects\CreateProjectTemplate;
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Actions\Projects\UpdateProjectTemplate;
+use App\Http\Requests\StoreProjectTemplateRequest;
+use App\Http\Requests\UpdateProjectTemplateRequest;
+use App\Http\Resources\ProjectResource;
+use App\Http\Resources\ProjectTemplateResource;
+use App\Models\Project;
+use App\Models\ProjectTemplate;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Inertia\Inertia;
+use Inertia\Response;
+
+class ProjectTemplateController extends Controller
+{
+    public function __construct(
+        private readonly CreateProjectTemplate $createProjectTemplate,
+        private readonly UpdateProjectTemplate $updateProjectTemplate,
+    ) {}
+
+    public function index(Request $request): Response
+    {
+        return Inertia::render('project-templates/Index', [
+            'status' => session('status'),
+            'templates' => ProjectTemplateResource::collection(
+                ProjectTemplate::query()
+                    ->published()
+                    ->with('sourceProject')
+                    ->withCount('linkedProjects')
+                    ->orderBy('name')
+                    ->get(),
+            )->resolve(),
+        ]);
+    }
+
+    public function edit(ProjectTemplate $projectTemplate): Response
+    {
+        abort_if(! $projectTemplate->is_published, 404);
+
+        $projectTemplate->load('sourceProject')->loadCount('linkedProjects');
+
+        return Inertia::render('project-templates/Edit', [
+            'copyAreaOptions' => DuplicateProjectConfiguration::copyAreaOptions(),
+            'template' => ProjectTemplateResource::make($projectTemplate)->resolve(),
+        ]);
+    }
+
+    public function create(Project $project): Response
+    {
+        return Inertia::render('project-templates/Create', [
+            'copyAreaOptions' => DuplicateProjectConfiguration::copyAreaOptions(),
+            'project' => ProjectResource::make($project)->resolve(),
+        ]);
+    }
+
+    public function store(StoreProjectTemplateRequest $request, Project $project): RedirectResponse
+    {
+        $template = $this->createProjectTemplate->handle($project, $request->validated());
+
+        return to_route('project-templates.index')
+            ->with('status', "Template {$template->name} was created.");
+    }
+
+    public function update(UpdateProjectTemplateRequest $request, ProjectTemplate $projectTemplate): RedirectResponse
+    {
+        abort_if(! $projectTemplate->is_published, 404);
+
+        $template = $this->updateProjectTemplate->handle($projectTemplate, $request->validated());
+
+        return to_route('project-templates.index')
+            ->with('status', "Template {$template->name} was updated.");
+    }
+
+    public function destroy(ProjectTemplate $projectTemplate): RedirectResponse
+    {
+        abort_if(! $projectTemplate->is_published, 404);
+
+        $templateName = $projectTemplate->name;
+        $projectTemplate->delete();
+
+        return to_route('project-templates.index')
+            ->with('status', "Template {$templateName} was deleted.");
+    }
+}

app/Http/Requests/Api/MoveProjectTicketRequest.php

@@ -29,7 +29,9 @@ class MoveProjectTicketRequest extends FormRequest
             'ticket_status_id' => [
                 'required',
                 'integer',
-                Rule::exists('ticket_statuses', 'id')->where('project_id', $project->id),
+                Rule::exists('ticket_statuses', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
             ],
         ];
     }

app/Http/Requests/DestroyProjectTicketTypeRequest.php

@@ -34,7 +34,9 @@ class DestroyProjectTicketTypeRequest extends FormRequest
             'replacement_ticket_type_id' => [
                 'nullable',
                 'integer',
-                Rule::exists('ticket_types', 'id')->where('project_id', $project->id),
+                Rule::exists('ticket_types', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
             ],
         ];
     }

app/Http/Requests/MoveProjectTicketRequest.php

@@ -34,7 +34,9 @@ class MoveProjectTicketRequest extends FormRequest
             'ticket_status_id' => [
                 'required',
                 'integer',
-                Rule::exists('ticket_statuses', 'id')->where('project_id', $project->id),
+                Rule::exists('ticket_statuses', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
             ],
             'redirect_to' => ['required', 'string', Rule::in(['backlog', 'board'])],
         ];

app/Http/Requests/ResetProjectTemplateRequest.php

@@ -0,0 +1,107 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Models\Project;
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Support\Arr;
+use Illuminate\Validation\Rule;
+use Illuminate\Validation\Validator;
+
+class ResetProjectTemplateRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * @return array<string, ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        /** @var Project $project */
+        $project = $this->route('project');
+
+        return [
+            'areas' => ['sometimes', 'array', 'min:1'],
+            'areas.*' => ['required', 'string', Rule::in(DuplicateProjectConfiguration::copyableAreas())],
+            'confirmation_key' => [
+                'required_without:areas',
+                'string',
+                Rule::in([$project->key]),
+            ],
+            'status_replacements' => ['sometimes', 'array'],
+            'status_replacements.*' => [
+                'required',
+                'integer',
+                Rule::exists('ticket_statuses', 'id')->where('project_id', $project->id),
+            ],
+        ];
+    }
+
+    /** @return array<int, callable(Validator): void> */
+    public function after(): array
+    {
+        return [
+            function (Validator $validator): void {
+                if ($validator->errors()->isNotEmpty()) {
+                    return;
+                }
+
+                /** @var Project $project */
+                $project = $this->route('project');
+                $validated = $validator->validated();
+                $areas = array_values(Arr::get(
+                    $validated,
+                    'areas',
+                    DuplicateProjectConfiguration::copyableAreas(),
+                ));
+
+                if (! in_array(DuplicateProjectConfiguration::COPY_TICKET_STATUSES, $areas, true)) {
+                    return;
+                }
+
+                $project->loadMissing('projectTemplate');
+                $configuration = app(DuplicateProjectConfiguration::class)->normalizeConfiguration(
+                    $project->projectTemplate?->configuration_snapshot ?? [],
+                );
+                $templateStatuses = Arr::get(
+                    $configuration,
+                    DuplicateProjectConfiguration::COPY_TICKET_STATUSES,
+                    [],
+                );
+                $statuses = $project->ticketStatuses()->withCount('tickets')->get()->values();
+                $allowedReplacementIds = $statuses->take(count($templateStatuses))->pluck('id');
+                $replacements = Arr::get($validated, 'status_replacements', []);
+
+                foreach ($statuses->slice(count($templateStatuses)) as $status) {
+                    if ($status->tickets_count === 0) {
+                        continue;
+                    }
+
+                    $replacementId = (int) Arr::get($replacements, (string) $status->id, 0);
+                    if (! $allowedReplacementIds->contains($replacementId)) {
+                        $validator->errors()->add(
+                            "status_replacements.{$status->id}",
+                            "Choose a replacement status for {$status->name}.",
+                        );
+                    }
+                }
+            },
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'confirmation_key.in' => 'Enter the exact project key to reset this project to its template baseline.',
+            'areas.*.in' => 'Choose a valid template area to reset.',
+        ];
+    }
+}

app/Http/Requests/StoreProjectRequest.php

@@ -2,6 +2,10 @@
 
 namespace App\Http\Requests;
 
+use App\Actions\Permissions\PermissionService;
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Enums\Permission;
+use App\Models\Project;
 use Illuminate\Contracts\Validation\ValidationRule;
 use Illuminate\Foundation\Http\FormRequest;
 use Illuminate\Support\Arr;
@@ -20,12 +24,21 @@ class StoreProjectRequest extends FormRequest
     protected function prepareForValidation(): void
     {
         $key = Arr::get($this->all(), 'key');
+        $creationMode = Arr::get($this->all(), 'creation_mode', 'scratch');
+        $copyAreas = Arr::get($this->all(), 'copy_areas', []);
 
         if ($key !== null) {
             $this->merge([
                 'key' => strtoupper(trim((string) $key)),
             ]);
         }
+
+        $this->merge([
+            'creation_mode' => is_string($creationMode) ? trim($creationMode) : 'scratch',
+            'copy_areas' => is_array($copyAreas)
+                ? array_values($copyAreas)
+                : ($copyAreas === null || $copyAreas === '' ? [] : [(string) $copyAreas]),
+        ]);
     }
 
     /**
@@ -36,6 +49,7 @@ class StoreProjectRequest extends FormRequest
     public function rules(): array
     {
         return [
+            'creation_mode' => ['required', 'string', Rule::in(['scratch', 'duplicate', 'template'])],
             'key' => [
                 'required',
                 'string',
@@ -44,6 +58,51 @@ class StoreProjectRequest extends FormRequest
                 Rule::unique('projects', 'key'),
             ],
             'name' => ['required', 'string', 'max:255'],
+            'source_project_id' => [
+                Rule::requiredIf(fn (): bool => $this->input('creation_mode') === 'duplicate'),
+                'nullable',
+                'integer',
+                Rule::exists('projects', 'id'),
+                function (string $attribute, mixed $value, \Closure $fail): void {
+                    if ($value === null || $value === '') {
+                        return;
+                    }
+
+                    $project = Project::query()->find($value);
+
+                    if ($project === null) {
+                        return;
+                    }
+
+                    $permissionService = app(PermissionService::class);
+
+                    if (! $permissionService->allows($this->user(), Permission::ProjectRead, $project)) {
+                        $fail('Select a project you can access as the duplication source.');
+                    }
+                },
+            ],
+            'source_template_id' => [
+                Rule::requiredIf(fn (): bool => $this->input('creation_mode') === 'template'),
+                'nullable',
+                'integer',
+                Rule::exists('project_templates', 'id')->where(fn ($query) => $query->where('is_published', true)),
+            ],
+            'copy_areas' => ['nullable', 'array'],
+            'copy_areas.*' => [
+                'string',
+                Rule::in(DuplicateProjectConfiguration::acceptedCopyAreas()),
+            ],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'source_project_id.required' => 'Select a source project to duplicate from.',
+            'source_template_id.required' => 'Select a template to create the project from.',
         ];
     }
 }

app/Http/Requests/StoreProjectTemplateRequest.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Support\Str;
+use Illuminate\Validation\Rule;
+
+class StoreProjectTemplateRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return $this->user()?->can('create-project') ?? false;
+    }
+
+    protected function prepareForValidation(): void
+    {
+        if ($this->filled('slug')) {
+            $this->merge([
+                'slug' => Str::slug((string) $this->input('slug')),
+            ]);
+        }
+    }
+
+    /**
+     * @return array<string, ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'name' => ['required', 'string', 'max:255'],
+            'slug' => ['required', 'string', 'max:255', 'alpha_dash', Rule::unique('project_templates', 'slug')],
+            'copy_areas' => ['required', 'array', 'min:1'],
+            'copy_areas.*' => ['string', Rule::in(DuplicateProjectConfiguration::acceptedCopyAreas())],
+        ];
+    }
+}

app/Http/Requests/StoreProjectTicketBranchRequest.php

@@ -2,8 +2,10 @@
 
 namespace App\Http\Requests;
 
+use App\Models\Project;
 use Illuminate\Contracts\Validation\ValidationRule;
 use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
 
 class StoreProjectTicketBranchRequest extends FormRequest
 {
@@ -22,9 +24,18 @@ class StoreProjectTicketBranchRequest extends FormRequest
      */
     public function rules(): array
     {
+        /** @var Project $project */
+        $project = $this->route('project');
+
         return [
             'branch_name' => ['required', 'string', 'max:255'],
-            'repository_connection_id' => ['required', 'integer', 'exists:repository_connections,id'],
+            'repository_connection_id' => [
+                'required',
+                'integer',
+                Rule::exists('repository_connections', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
+            ],
         ];
     }
 }

app/Http/Requests/StoreProjectTicketRequest.php

@@ -66,17 +66,23 @@ class StoreProjectTicketRequest extends FormRequest
             'ticket_priority_id' => [
                 'required',
                 'integer',
-                Rule::exists('ticket_priorities', 'id')->where('project_id', $project->id),
+                Rule::exists('ticket_priorities', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
             ],
             'ticket_status_id' => [
                 'required',
                 'integer',
-                Rule::exists('ticket_statuses', 'id')->where('project_id', $project->id),
+                Rule::exists('ticket_statuses', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
             ],
             'ticket_type_id' => [
                 'required',
                 'integer',
-                Rule::exists('ticket_types', 'id')->where('project_id', $project->id),
+                Rule::exists('ticket_types', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
             ],
             'story_points' => ['nullable', 'integer', 'min:0'],
             'title' => ['required', 'string', 'max:255'],

app/Http/Requests/StoreTicketLinkRequest.php

@@ -38,7 +38,9 @@ class StoreTicketLinkRequest extends FormRequest
             'ticket_link_type_id' => [
                 'required',
                 'integer',
-                Rule::exists('ticket_link_types', 'id')->where('project_id', $project->id),
+                Rule::exists('ticket_link_types', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
             ],
         ];
     }

app/Http/Requests/StoreTicketStatusRequest.php

@@ -31,7 +31,9 @@ class StoreTicketStatusRequest extends FormRequest
             'board_column_id' => [
                 'nullable',
                 'integer',
-                Rule::exists('board_columns', 'id')->where('project_id', $project->id),
+                Rule::exists('board_columns', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
             ],
             'name' => ['required', 'string', 'max:255'],
         ];

app/Http/Requests/SwitchProjectTemplateRequest.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Models\Project;
+use App\Models\ProjectTemplate;
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class SwitchProjectTemplateRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * @return array<string, ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        /** @var Project $project */
+        $project = $this->route('project');
+
+        return [
+            'confirmation_key' => [
+                'required',
+                'string',
+                Rule::in([$project->key]),
+            ],
+            'source_template_id' => [
+                'required',
+                'integer',
+                Rule::exists(ProjectTemplate::class, 'id')->where('is_published', true),
+                Rule::notIn(array_filter([$project->project_template_id])),
+            ],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'confirmation_key.in' => 'Enter the exact project key to confirm the template switch.',
+            'source_template_id.not_in' => 'Choose a different published template to switch this project.',
+        ];
+    }
+}

app/Http/Requests/UpdateProjectTemplateRequest.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Models\ProjectTemplate;
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class UpdateProjectTemplateRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return $this->user()?->can('create-project') ?? false;
+    }
+
+    /**
+     * @return array<string, ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        /** @var ProjectTemplate|null $projectTemplate */
+        $projectTemplate = $this->route('projectTemplate');
+        $requiresImpactConfirmation = $projectTemplate?->linkedProjects()->exists() ?? false;
+
+        return [
+            'name' => ['required', 'string', 'max:255'],
+            'copy_areas' => ['required', 'array', 'min:1'],
+            'copy_areas.*' => ['string', Rule::in(DuplicateProjectConfiguration::acceptedCopyAreas())],
+            'confirm_linked_projects_update' => [
+                Rule::requiredIf($requiresImpactConfirmation),
+                'accepted',
+            ],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'confirm_linked_projects_update.accepted' => 'Acknowledge the linked project warning before saving template changes.',
+        ];
+    }
+}

app/Http/Requests/UpdateProjectTicketRequest.php

@@ -68,7 +68,9 @@ class UpdateProjectTicketRequest extends FormRequest
             'field_values.*.ticket_field_definition_id' => [
                 'required',
                 'integer',
-                Rule::exists('ticket_field_definitions', 'id')->where('project_id', $project->id),
+                Rule::exists('ticket_field_definitions', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
             ],
             'field_values.*.value_number' => ['nullable', 'numeric'],
             'field_values.*.value_user_id' => ['nullable', 'integer', Rule::exists('users', 'id')],
@@ -81,12 +83,16 @@ class UpdateProjectTicketRequest extends FormRequest
             'ticket_priority_id' => [
                 'required',
                 'integer',
-                Rule::exists('ticket_priorities', 'id')->where('project_id', $project->id),
+                Rule::exists('ticket_priorities', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
             ],
             'ticket_type_id' => [
                 'required',
                 'integer',
-                Rule::exists('ticket_types', 'id')->where('project_id', $project->id),
+                Rule::exists('ticket_types', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
             ],
             'title' => ['required', 'string', 'max:255'],
             'story_points' => ['nullable', 'integer', 'min:0'],

app/Http/Requests/UpdateTicketStatusTransitionsRequest.php

@@ -34,7 +34,9 @@ class UpdateTicketStatusTransitionsRequest extends FormRequest
             'allowed_ticket_status_ids' => ['nullable', 'array'],
             'allowed_ticket_status_ids.*' => [
                 'integer',
-                Rule::exists('ticket_statuses', 'id')->where('project_id', $project->id),
+                Rule::exists('ticket_statuses', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
             ],
         ];
     }

app/Http/Requests/ValidateProjectTicketBranchRequest.php

@@ -2,8 +2,10 @@
 
 namespace App\Http\Requests;
 
+use App\Models\Project;
 use Illuminate\Contracts\Validation\ValidationRule;
 use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
 
 class ValidateProjectTicketBranchRequest extends FormRequest
 {
@@ -22,9 +24,18 @@ class ValidateProjectTicketBranchRequest extends FormRequest
      */
     public function rules(): array
     {
+        /** @var Project $project */
+        $project = $this->route('project');
+
         return [
             'branch_name' => ['required', 'string', 'max:255'],
-            'repository_connection_id' => ['required', 'integer', 'exists:repository_connections,id'],
+            'repository_connection_id' => [
+                'required',
+                'integer',
+                Rule::exists('repository_connections', 'id')->where(
+                    fn ($query) => $query->where('project_id', $project->id),
+                ),
+            ],
         ];
     }
 }

app/Http/Resources/ProjectResource.php

@@ -2,8 +2,10 @@
 
 namespace App\Http\Resources;
 
+use App\Actions\Projects\ResolveProjectTemplateState;
 use Illuminate\Http\Request;
 use Illuminate\Http\Resources\Json\JsonResource;
+use Illuminate\Support\Arr;
 
 class ProjectResource extends JsonResource
 {
@@ -14,10 +16,33 @@ class ProjectResource extends JsonResource
      */
     public function toArray(Request $request): array
     {
+        $this->resource->loadMissing('projectTemplate');
+
+        $templateState = app(ResolveProjectTemplateState::class)->handle($this->resource);
+
         return [
             'id' => $this->id,
             'name' => $this->name,
             'key' => $this->key,
+            'project_template_id' => $this->project_template_id,
+            'project_template' => $this->projectTemplate === null
+                ? null
+                : ProjectTemplateResource::make($this->projectTemplate)->resolve(),
+            'template_state' => $templateState === null
+                ? null
+                : [
+                    'effective_configuration' => Arr::get($templateState, 'effectiveConfiguration', []),
+                    'inherited_areas' => Arr::get($templateState, 'inheritedAreas', []),
+                    'inherited_configuration' => Arr::get($templateState, 'inheritedConfiguration', []),
+                    'inherits_from_template' => Arr::get($templateState, 'inheritsFromTemplate', false),
+                    'overridden_areas' => Arr::get($templateState, 'overriddenAreas', []),
+                    'overridden_configuration' => Arr::get($templateState, 'overriddenConfiguration', []),
+                    'reset_requirements' => Arr::get($templateState, 'resetRequirements', []),
+                    'template_configuration' => Arr::get($templateState, 'templateConfiguration', []),
+                    'template_id' => Arr::get($templateState, 'templateId'),
+                    'template_name' => Arr::get($templateState, 'templateName'),
+                    'template_slug' => Arr::get($templateState, 'templateSlug'),
+                ],
             'show_author' => $this->show_author,
             'show_story_points' => $this->show_story_points,
             'created_at' => $this->created_at?->toISOString(),

app/Http/Resources/ProjectTemplateResource.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace App\Http\Resources;
+
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Models\ProjectTemplate;
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+use Illuminate\Support\Arr;
+
+class ProjectTemplateResource extends JsonResource
+{
+    /**
+     * Transform the resource into an array.
+     *
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        if ($this->resource instanceof ProjectTemplate) {
+            $configuration = app(DuplicateProjectConfiguration::class);
+
+            return [
+                'id' => $this->id,
+                'project_id' => $this->project_id,
+                'source_project_id' => $this->source_project_id,
+                'source_project' => $this->relationLoaded('sourceProject') && $this->sourceProject !== null
+                    ? ProjectResource::make($this->sourceProject)->resolve()
+                    : null,
+                'name' => $this->name,
+                'slug' => $this->slug,
+                'is_published' => $this->is_published,
+                'copy_areas' => $configuration->normalizeCopyAreas($this->copy_areas ?? []),
+                'configuration_snapshot' => $configuration->normalizeConfiguration(
+                    $this->configuration_snapshot ?? [],
+                ),
+                'linked_project_count' => $this->whenCounted('linkedProjects'),
+                'created_at' => $this->created_at?->toISOString(),
+                'updated_at' => $this->updated_at?->toISOString(),
+            ];
+        }
+
+        return [
+            'id' => Arr::get($this->resource, 'id'),
+            'project_id' => Arr::get($this->resource, 'project_id'),
+            'source_project_id' => Arr::get($this->resource, 'source_project_id'),
+            'source_project' => Arr::get($this->resource, 'source_project'),
+            'name' => Arr::get($this->resource, 'name'),
+            'slug' => Arr::get($this->resource, 'slug'),
+            'is_published' => Arr::get($this->resource, 'is_published', true),
+            'copy_areas' => Arr::get($this->resource, 'copy_areas', []),
+            'configuration_snapshot' => Arr::get($this->resource, 'configuration_snapshot', []),
+            'linked_project_count' => Arr::get($this->resource, 'linked_project_count'),
+            'created_at' => Arr::get($this->resource, 'created_at'),
+            'updated_at' => Arr::get($this->resource, 'updated_at'),
+        ];
+    }
+}

app/Models/BoardColumn.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use App\Models\Concerns\SyncsProjectTemplateOwnership;
 use Database\Factories\BoardColumnFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
@@ -10,11 +11,19 @@ use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\Relations\HasManyThrough;
 
-#[Fillable(['name', 'position', 'project_id'])]
+#[Fillable(['name', 'position', 'project_id', 'project_template_id'])]
 class BoardColumn extends Model
 {
     /** @use HasFactory<BoardColumnFactory> */
     use HasFactory;
+    use SyncsProjectTemplateOwnership;
+
+    protected static function booted(): void
+    {
+        static::saving(function (self $boardColumn): void {
+            $boardColumn->syncProjectTemplateOwnership();
+        });
+    }
 
     public function project(): BelongsTo
     {

app/Models/Concerns/SyncsProjectTemplateOwnership.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Models\Concerns;
+
+use App\Models\Project;
+use App\Models\ProjectTemplate;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+trait SyncsProjectTemplateOwnership
+{
+    protected function syncProjectTemplateOwnership(): void
+    {
+        $projectTemplateId = $this->getAttribute('project_template_id');
+        $projectId = $this->getAttribute('project_id');
+
+        if ($projectTemplateId === null && $projectId !== null) {
+            $projectTemplateId = Project::query()
+                ->whereKey($projectId)
+                ->value('project_template_id');
+
+            if ($projectTemplateId !== null) {
+                $this->setAttribute('project_template_id', $projectTemplateId);
+            }
+        }
+
+        if ($projectId === null && $projectTemplateId !== null) {
+            $projectId = ProjectTemplate::query()
+                ->whereKey($projectTemplateId)
+                ->value('project_id');
+
+            if ($projectId !== null) {
+                $this->setAttribute('project_id', $projectId);
+            }
+        }
+    }
+
+    public function projectTemplate(): BelongsTo
+    {
+        return $this->belongsTo(ProjectTemplate::class);
+    }
+}

app/Models/NotificationAction.php

@@ -4,6 +4,7 @@ namespace App\Models;
 
 use App\Enums\NotificationChannel;
 use App\Enums\NotificationEventType;
+use App\Models\Concerns\SyncsProjectTemplateOwnership;
 use Database\Factories\NotificationActionFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Attributes\Hidden;
@@ -23,12 +24,14 @@ use Illuminate\Database\Eloquent\Relations\HasMany;
     'message_template',
     'name',
     'project_id',
+    'project_template_id',
 ])]
 #[Hidden(['delivery_url'])]
 class NotificationAction extends Model
 {
     /** @use HasFactory<NotificationActionFactory> */
     use HasFactory;
+    use SyncsProjectTemplateOwnership;
 
     /**
      * @return array<string, string>
@@ -45,6 +48,13 @@ class NotificationAction extends Model
         ];
     }
 
+    protected static function booted(): void
+    {
+        static::saving(function (self $notificationAction): void {
+            $notificationAction->syncProjectTemplateOwnership();
+        });
+    }
+
     public function scopeEnabled(Builder $query): Builder
     {
         return $query->where('enabled', true);

app/Models/Project.php

@@ -7,11 +7,13 @@ use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\HasOne;
 use Illuminate\Database\Eloquent\Relations\MorphMany;
 use Illuminate\Support\Str;
 
-#[Fillable(['name', 'key', 'show_author', 'show_story_points'])]
+#[Fillable(['name', 'key', 'project_template_id', 'show_author', 'show_story_points', 'template_overrides'])]
 class Project extends Model
 {
     /** @use HasFactory<ProjectFactory> */
@@ -22,6 +24,7 @@ class Project extends Model
         return [
             'show_author' => 'boolean',
             'show_story_points' => 'boolean',
+            'template_overrides' => 'array',
         ];
     }
 
@@ -44,6 +47,17 @@ class Project extends Model
         return $this->morphMany(PermissionAssignment::class, 'scope');
     }
 
+    public function projectTemplate(): BelongsTo
+    {
+        return $this->belongsTo(ProjectTemplate::class, 'project_template_id');
+    }
+
+    public function baseTemplate(): HasOne
+    {
+        return $this->hasOne(ProjectTemplate::class)
+            ->where('is_published', false);
+    }
+
     public function boardColumns(): HasMany
     {
         return $this->hasMany(BoardColumn::class)
@@ -95,6 +109,21 @@ class Project extends Model
             ->orderBy('id');
     }
 
+    /** @return list<string> */
+    public function configurationRelations(): array
+    {
+        return [
+            'boardColumns',
+            'notificationActions',
+            'repositoryConnections',
+            'ticketFieldDefinitions',
+            'ticketLinkTypes',
+            'ticketPriorities',
+            'ticketStatuses',
+            'ticketTypes',
+        ];
+    }
+
     public function tickets(): HasMany
     {
         return $this->hasMany(Ticket::class)

app/Models/ProjectTemplate.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Models;
+
+use Database\Factories\ProjectTemplateFactory;
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+#[Fillable(['project_id', 'source_project_id', 'name', 'slug', 'is_published', 'copy_areas', 'configuration_snapshot'])]
+class ProjectTemplate extends Model
+{
+    /** @use HasFactory<ProjectTemplateFactory> */
+    use HasFactory;
+
+    protected function casts(): array
+    {
+        return [
+            'copy_areas' => 'array',
+            'configuration_snapshot' => 'array',
+            'is_published' => 'boolean',
+        ];
+    }
+
+    public function scopePublished(Builder $query): Builder
+    {
+        return $query->where('is_published', true);
+    }
+
+    public function project(): BelongsTo
+    {
+        return $this->belongsTo(Project::class);
+    }
+
+    public function sourceProject(): BelongsTo
+    {
+        return $this->belongsTo(Project::class, 'source_project_id');
+    }
+
+    public function linkedProjects(): HasMany
+    {
+        return $this->hasMany(Project::class, 'project_template_id');
+    }
+}

app/Models/RepositoryConnection.php

@@ -4,6 +4,7 @@ namespace App\Models;
 
 use App\Actions\Git\Data\GitRepository;
 use App\Actions\Git\GitProviderKey;
+use App\Models\Concerns\SyncsProjectTemplateOwnership;
 use Database\Factories\RepositoryConnectionFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
@@ -14,6 +15,7 @@ use Illuminate\Database\Eloquent\Relations\BelongsTo;
     'base_url',
     'owner_name',
     'project_id',
+    'project_template_id',
     'provider',
     'provider_repository_id',
     'repository_full_name',
@@ -24,6 +26,7 @@ class RepositoryConnection extends Model
 {
     /** @use HasFactory<RepositoryConnectionFactory> */
     use HasFactory;
+    use SyncsProjectTemplateOwnership;
 
     /**
      * @return array<string, string>
@@ -35,6 +38,13 @@ class RepositoryConnection extends Model
         ];
     }
 
+    protected static function booted(): void
+    {
+        static::saving(function (self $repositoryConnection): void {
+            $repositoryConnection->syncProjectTemplateOwnership();
+        });
+    }
+
     public function project(): BelongsTo
     {
         return $this->belongsTo(Project::class);

app/Models/TicketFieldDefinition.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use App\Models\Concerns\SyncsProjectTemplateOwnership;
 use Database\Factories\TicketFieldDefinitionFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
@@ -9,7 +10,7 @@ use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 
-#[Fillable(['field_type', 'label', 'position', 'project_id'])]
+#[Fillable(['field_type', 'label', 'position', 'project_id', 'project_template_id'])]
 class TicketFieldDefinition extends Model
 {
     /**
@@ -22,6 +23,14 @@ class TicketFieldDefinition extends Model
 
     /** @use HasFactory<TicketFieldDefinitionFactory> */
     use HasFactory;
+    use SyncsProjectTemplateOwnership;
+
+    protected static function booted(): void
+    {
+        static::saving(function (self $ticketFieldDefinition): void {
+            $ticketFieldDefinition->syncProjectTemplateOwnership();
+        });
+    }
 
     public function project(): BelongsTo
     {

app/Models/TicketLinkType.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use App\Models\Concerns\SyncsProjectTemplateOwnership;
 use Database\Factories\TicketLinkTypeFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
@@ -9,11 +10,19 @@ use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 
-#[Fillable(['label', 'counterpart_label', 'position', 'project_id'])]
+#[Fillable(['label', 'counterpart_label', 'position', 'project_id', 'project_template_id'])]
 class TicketLinkType extends Model
 {
     /** @use HasFactory<TicketLinkTypeFactory> */
     use HasFactory;
+    use SyncsProjectTemplateOwnership;
+
+    protected static function booted(): void
+    {
+        static::saving(function (self $ticketLinkType): void {
+            $ticketLinkType->syncProjectTemplateOwnership();
+        });
+    }
 
     public function counterpartLabel(): string
     {

app/Models/TicketPriority.php

@@ -2,20 +2,36 @@
 
 namespace App\Models;
 
+use App\Models\Concerns\SyncsProjectTemplateOwnership;
 use Database\Factories\TicketPriorityFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
-#[Fillable(['name', 'position', 'project_id'])]
+#[Fillable(['name', 'position', 'project_id', 'project_template_id'])]
 class TicketPriority extends Model
 {
     /** @use HasFactory<TicketPriorityFactory> */
     use HasFactory;
 
+    use SyncsProjectTemplateOwnership;
+
+    protected static function booted(): void
+    {
+        static::saving(function (self $ticketPriority): void {
+            $ticketPriority->syncProjectTemplateOwnership();
+        });
+    }
+
     public function project(): BelongsTo
     {
         return $this->belongsTo(Project::class);
     }
+
+    public function tickets(): HasMany
+    {
+        return $this->hasMany(Ticket::class);
+    }
 }

app/Models/TicketStatus.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use App\Models\Concerns\SyncsProjectTemplateOwnership;
 use Database\Factories\TicketStatusFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
@@ -11,15 +12,23 @@ use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Support\Str;
 
-#[Fillable(['board_column_id', 'name', 'position', 'project_id', 'slug'])]
+#[Fillable(['board_column_id', 'name', 'position', 'project_id', 'project_template_id', 'slug'])]
 class TicketStatus extends Model
 {
     /** @use HasFactory<TicketStatusFactory> */
     use HasFactory;
+    use SyncsProjectTemplateOwnership;
 
     protected static function booted(): void
     {
         static::saving(function (self $ticketStatus): void {
+            if ($ticketStatus->project_template_id === null && $ticketStatus->board_column_id !== null) {
+                $ticketStatus->project_template_id = BoardColumn::query()
+                    ->whereKey($ticketStatus->board_column_id)
+                    ->value('project_template_id');
+            }
+
+            $ticketStatus->syncProjectTemplateOwnership();
             $ticketStatus->slug = Str::slug($ticketStatus->name);
         });
     }

app/Models/TicketType.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use App\Models\Concerns\SyncsProjectTemplateOwnership;
 use Database\Factories\TicketTypeFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
@@ -9,11 +10,19 @@ use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 
-#[Fillable(['name', 'position', 'project_id', 'is_parent'])]
+#[Fillable(['name', 'position', 'project_id', 'project_template_id', 'is_parent'])]
 class TicketType extends Model
 {
     /** @use HasFactory<TicketTypeFactory> */
     use HasFactory;
+    use SyncsProjectTemplateOwnership;
+
+    protected static function booted(): void
+    {
+        static::saving(function (self $ticketType): void {
+            $ticketType->syncProjectTemplateOwnership();
+        });
+    }
 
     protected function casts(): array
     {

app/Observers/ProjectConfigurationObserver.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace App\Observers;
+
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Actions\Projects\ProjectTemplateOverrideManager;
+use App\Actions\Projects\RefreshProjectBaseTemplate;
+use App\Models\BoardColumn;
+use App\Models\NotificationAction;
+use App\Models\RepositoryConnection;
+use App\Models\TicketFieldDefinition;
+use App\Models\TicketLinkType;
+use App\Models\TicketPriority;
+use App\Models\TicketStatus;
+use App\Models\TicketType;
+use Illuminate\Database\Eloquent\Model;
+
+class ProjectConfigurationObserver
+{
+    public function __construct(
+        private readonly ProjectTemplateOverrideManager $projectTemplateOverrideManager,
+        private readonly RefreshProjectBaseTemplate $refreshProjectBaseTemplate,
+    ) {}
+
+    public function saved(Model $model): void
+    {
+        $this->markOverride($model);
+    }
+
+    public function deleted(Model $model): void
+    {
+        $this->markOverride($model);
+    }
+
+    private function markOverride(Model $model): void
+    {
+        if (! $this->projectTemplateOverrideManager->isRecording()) {
+            return;
+        }
+
+        $project = $model->project()->first();
+
+        if ($project === null) {
+            return;
+        }
+
+        $area = match (true) {
+            $model instanceof BoardColumn => DuplicateProjectConfiguration::COPY_BOARD_COLUMNS,
+            $model instanceof TicketStatus => DuplicateProjectConfiguration::COPY_TICKET_STATUSES,
+            $model instanceof TicketType => DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+            $model instanceof TicketPriority => DuplicateProjectConfiguration::COPY_TICKET_PRIORITIES,
+            $model instanceof TicketFieldDefinition => DuplicateProjectConfiguration::COPY_TICKET_FIELDS,
+            $model instanceof TicketLinkType => DuplicateProjectConfiguration::COPY_TICKET_LINK_TYPES,
+            $model instanceof RepositoryConnection => DuplicateProjectConfiguration::COPY_REPOSITORY_CONNECTIONS,
+            $model instanceof NotificationAction => DuplicateProjectConfiguration::COPY_NOTIFICATION_ACTIONS,
+            default => null,
+        };
+
+        if ($area === null) {
+            return;
+        }
+
+        $this->refreshProjectBaseTemplate->handle($project, $area);
+        $this->projectTemplateOverrideManager->mark($project, $area);
+    }
+}

app/Providers/AppServiceProvider.php

@@ -8,9 +8,18 @@ use App\Actions\Notifications\TicketCreated;
 use App\Actions\Notifications\TicketStatusChanged;
 use App\Actions\Permissions\PermissionService;
 use App\Enums\Permission;
+use App\Models\BoardColumn;
+use App\Models\NotificationAction;
 use App\Models\Project;
+use App\Models\RepositoryConnection;
 use App\Models\Team;
+use App\Models\TicketFieldDefinition;
+use App\Models\TicketLinkType;
+use App\Models\TicketPriority;
+use App\Models\TicketStatus;
+use App\Models\TicketType;
 use App\Models\User;
+use App\Observers\ProjectConfigurationObserver;
 use Carbon\CarbonImmutable;
 use Illuminate\Database\Eloquent\Relations\Relation;
 use Illuminate\Support\Facades\Date;
@@ -36,6 +45,18 @@ class AppServiceProvider extends ServiceProvider
      */
     public function boot(): void
     {
+        foreach ([
+            BoardColumn::class,
+            NotificationAction::class,
+            RepositoryConnection::class,
+            TicketFieldDefinition::class,
+            TicketLinkType::class,
+            TicketPriority::class,
+            TicketStatus::class,
+            TicketType::class,
+        ] as $model) {
+            $model::observe(ProjectConfigurationObserver::class);
+        }
 
         if ($this->app->environment() !== 'local') {
             URL::forceScheme('https');

database/factories/ProjectFactory.php

@@ -23,6 +23,7 @@ class ProjectFactory extends Factory
             'key' => Str::upper(fake()->unique()->lexify('?????')),
             'show_author' => true,
             'show_story_points' => true,
+            'template_overrides' => [],
         ];
     }
 }

database/factories/ProjectTemplateFactory.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Models\Project;
+use App\Models\ProjectTemplate;
+use Illuminate\Database\Eloquent\Factories\Factory;
+use Illuminate\Support\Str;
+
+/**
+ * @extends Factory<ProjectTemplate>
+ */
+class ProjectTemplateFactory extends Factory
+{
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            'source_project_id' => Project::factory(),
+            'name' => Str::title(fake()->unique()->words(3, true)),
+            'slug' => fake()->unique()->slug(),
+            'copy_areas' => [DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS],
+            'configuration_snapshot' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS => [
+                    'show_author' => true,
+                    'show_story_points' => true,
+                ],
+            ],
+        ];
+    }
+}

database/migrations/2026_05_25_011500_create_project_templates_table.php

@@ -0,0 +1,34 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('project_templates', function (Blueprint $table): void {
+            $table->id();
+            $table->foreignId('source_project_id')->nullable()->constrained('projects')->nullOnDelete();
+            $table->string('name');
+            $table->string('slug')->unique();
+            $table->json('copy_areas');
+            $table->json('configuration_snapshot');
+            $table->timestamps();
+
+            $table->index(['source_project_id', 'name']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('project_templates');
+    }
+};

database/migrations/2026_05_25_013000_project_templates_as_project_baselines.php

@@ -0,0 +1,54 @@
+<?php
+
+use App\Actions\Projects\CreateProjectBaseTemplate;
+use App\Models\Project;
+use App\Models\ProjectTemplate;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('project_templates', function (Blueprint $table): void {
+            $table->foreignId('project_id')->nullable()->after('id')->constrained('projects')->nullOnDelete();
+            $table->boolean('is_published')->default(true)->after('slug');
+        });
+
+        Schema::table('projects', function (Blueprint $table): void {
+            $table->foreignId('project_template_id')->nullable()->after('key')->constrained('project_templates')->nullOnDelete();
+        });
+
+        $projects = Project::query()->whereNull('project_template_id')->get();
+        $createProjectBaseTemplate = app(CreateProjectBaseTemplate::class);
+
+        foreach ($projects as $project) {
+            $baseTemplate = $createProjectBaseTemplate->handle($project);
+
+            $project->forceFill([
+                'project_template_id' => $baseTemplate->id,
+            ])->save();
+        }
+
+        ProjectTemplate::query()
+            ->whereNull('project_id')
+            ->update(['is_published' => true]);
+    }
+
+    public function down(): void
+    {
+        Project::query()->update(['project_template_id' => null]);
+
+        ProjectTemplate::query()->where('is_published', false)->delete();
+
+        Schema::table('projects', function (Blueprint $table): void {
+            $table->dropConstrainedForeignId('project_template_id');
+        });
+
+        Schema::table('project_templates', function (Blueprint $table): void {
+            $table->dropConstrainedForeignId('project_id');
+            $table->dropColumn('is_published');
+        });
+    }
+};

database/migrations/2026_06_05_161500_move_project_metadata_to_project_templates.php

@@ -0,0 +1,120 @@
+<?php
+
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Models\Project;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Support\Str;
+
+return new class extends Migration
+{
+    /**
+     * @var list<string>
+     */
+    private array $tables = [
+        'board_columns',
+        'ticket_field_definitions',
+        'ticket_link_types',
+        'ticket_priorities',
+        'ticket_statuses',
+        'ticket_types',
+        'repository_connections',
+        'notification_actions',
+    ];
+
+    public function up(): void
+    {
+        foreach ($this->tables as $table) {
+            Schema::table($table, function (Blueprint $table): void {
+                $table->foreignId('project_template_id')
+                    ->nullable()
+                    ->after('project_id')
+                    ->constrained('project_templates')
+                    ->nullOnDelete();
+            });
+        }
+
+        $projects = DB::table('projects')
+            ->leftJoin('project_templates', 'project_templates.id', '=', 'projects.project_template_id')
+            ->select([
+                'projects.id',
+                'projects.key',
+                'projects.name',
+                'projects.project_template_id',
+                'project_templates.project_id as template_project_id',
+                'project_templates.is_published as template_is_published',
+            ])
+            ->get();
+
+        foreach ($projects as $project) {
+            $projectTemplateId = $project->project_template_id;
+
+            if ($projectTemplateId === null || (
+                ! (bool) $project->template_is_published
+                && (int) ($project->template_project_id ?? 0) !== (int) $project->id
+            )) {
+                $projectTemplateId = DB::table('project_templates')->insertGetId([
+                    'project_id' => $project->id,
+                    'source_project_id' => $project->id,
+                    'name' => $project->name.' base template',
+                    'slug' => Str::lower($project->key).'-base-template',
+                    'is_published' => false,
+                    'copy_areas' => json_encode([
+                        'project_settings',
+                        'board_workflow',
+                        'ticket_types',
+                        'ticket_priorities',
+                        'ticket_fields',
+                        'ticket_link_types',
+                        'repository_connections',
+                        'notification_actions',
+                    ], JSON_THROW_ON_ERROR),
+                    'configuration_snapshot' => json_encode([], JSON_THROW_ON_ERROR),
+                    'created_at' => now(),
+                    'updated_at' => now(),
+                ]);
+
+                DB::table('projects')
+                    ->where('id', $project->id)
+                    ->update([
+                        'project_template_id' => $projectTemplateId,
+                        'updated_at' => now(),
+                    ]);
+            }
+
+            foreach ($this->tables as $table) {
+                DB::table($table)
+                    ->where('project_id', $project->id)
+                    ->update(['project_template_id' => $projectTemplateId]);
+            }
+
+            $projectModel = Project::query()->find($project->id);
+
+            if ($projectModel !== null && ! (bool) $project->template_is_published) {
+                DB::table('project_templates')
+                    ->where('id', $projectTemplateId)
+                    ->update([
+                        'configuration_snapshot' => json_encode(
+                            app(DuplicateProjectConfiguration::class)->export(
+                                $projectModel,
+                                DuplicateProjectConfiguration::copyableAreas(),
+                            ),
+                            JSON_THROW_ON_ERROR,
+                        ),
+                        'updated_at' => now(),
+                    ]);
+            }
+        }
+    }
+
+    public function down(): void
+    {
+        foreach (array_reverse($this->tables) as $table) {
+            Schema::table($table, function (Blueprint $table): void {
+                $table->dropConstrainedForeignId('project_template_id');
+            });
+        }
+    }
+};

database/migrations/2026_09_08_091101_add_template_override_tracking_to_projects_table.php

@@ -0,0 +1,63 @@
+<?php
+
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Models\Project;
+use App\Models\ProjectTemplate;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('projects', function (Blueprint $table): void {
+            $table->json('template_overrides')->default('[]')->after('project_template_id');
+        });
+
+        $configuration = app(DuplicateProjectConfiguration::class);
+
+        ProjectTemplate::query()->eachById(function (ProjectTemplate $template) use ($configuration): void {
+            $template->forceFill([
+                'copy_areas' => $configuration->normalizeCopyAreas($template->copy_areas ?? []),
+                'configuration_snapshot' => $configuration->normalizeConfiguration(
+                    $template->configuration_snapshot ?? [],
+                ),
+            ])->saveQuietly();
+        });
+
+        Project::query()
+            ->whereHas('projectTemplate', fn ($query) => $query->where('is_published', true))
+            ->with('projectTemplate')
+            ->eachById(function (Project $project) use ($configuration): void {
+                $templateConfiguration = $configuration->normalizeConfiguration(
+                    $project->projectTemplate?->configuration_snapshot ?? [],
+                );
+                $areas = array_values(array_unique([
+                    ...array_keys($templateConfiguration),
+                    ...DuplicateProjectConfiguration::copyableAreas(),
+                ]));
+                $currentConfiguration = $configuration->export($project, $areas);
+                $overrides = collect($areas)
+                    ->filter(fn (string $area): bool => ! array_key_exists($area, $templateConfiguration)
+                        || ($currentConfiguration[$area] ?? null) !== $templateConfiguration[$area])
+                    ->values()
+                    ->all();
+
+                $project->forceFill(['template_overrides' => $overrides])->saveQuietly();
+            });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('projects', function (Blueprint $table): void {
+            $table->dropColumn('template_overrides');
+        });
+    }
+};

resources/js/components/AppSidebar.vue

@@ -5,6 +5,7 @@ import {
     Folder,
     FolderGit2,
     LayoutGrid,
+    Layers3,
     Shield,
     Users,
 } from 'lucide-vue-next';
@@ -24,6 +25,7 @@ import {
 } from '@/components/ui/sidebar';
 import { dashboard } from '@/routes';
 import { index as adminUsers } from '@/routes/admin/users';
+import { index as projectTemplatesIndex } from '@/routes/project-templates';
 import { index as projectsIndex } from '@/routes/projects';
 import { index as teamsIndex } from '@/routes/teams';
 import type { NavItem } from '@/types';
@@ -44,6 +46,14 @@ const mainNavItems = computed<NavItem[]>(() => {
         },
     ];
 
+    if (page.props.auth.permissions.projectCreate) {
+        items.push({
+            title: 'Project templates',
+            href: projectTemplatesIndex(),
+            icon: Layers3,
+        });
+    }
+
     if (page.props.auth.permissions.globalAdmin) {
         items.push({
             title: 'Users',

resources/js/components/projects/TemplateInheritancePanel.vue

@@ -0,0 +1,177 @@
+<script setup lang="ts">
+import { useForm } from '@inertiajs/vue3';
+import ProjectController from '@/actions/App/Http/Controllers/ProjectController';
+import InputError from '@/components/InputError.vue';
+import { Badge } from '@/components/ui/badge';
+import { Button } from '@/components/ui/button';
+import {
+    Card,
+    CardContent,
+    CardDescription,
+    CardHeader,
+    CardTitle,
+} from '@/components/ui/card';
+import { Label } from '@/components/ui/label';
+import type { ProjectTemplateState, ProjectTemplateStateArea } from '@/types';
+import { computed } from 'vue';
+
+const props = defineProps<{
+    areas: string[];
+    projectId: number;
+    templateState?: ProjectTemplateState | null;
+}>();
+
+const form = useForm<{
+    areas: string[];
+    status_replacements: Record<string, number | undefined>;
+}>({
+    areas: [],
+    status_replacements: {},
+});
+
+const activeArea = computed(() => form.areas[0]);
+
+const inheritedAreas = computed(
+    () =>
+        props.templateState?.inheritedAreas.filter((area) =>
+            props.areas.includes(area.value),
+        ) ?? [],
+);
+
+const overriddenAreas = computed(
+    () =>
+        props.templateState?.overriddenAreas.filter((area) =>
+            props.areas.includes(area.value),
+        ) ?? [],
+);
+
+const statusRequirement = computed(
+    () => props.templateState?.resetRequirements?.ticket_statuses,
+);
+
+const canReset = (area: ProjectTemplateStateArea): boolean => {
+    if (area.value !== 'ticket_statuses') {
+        return true;
+    }
+
+    return (
+        statusRequirement.value?.removedStatuses.every(
+            (status) =>
+                form.status_replacements[String(status.id)] !== undefined,
+        ) ?? true
+    );
+};
+
+const resetArea = (area: ProjectTemplateStateArea): void => {
+    if (!canReset(area)) {
+        return;
+    }
+
+    form.areas = [area.value];
+    form.post(ProjectController.resetTemplate.url(props.projectId), {
+        preserveScroll: true,
+        onSuccess: () => form.reset(),
+    });
+};
+</script>
+
+<template>
+    <Card
+        v-if="
+            templateState?.inheritsFromTemplate &&
+            (inheritedAreas.length > 0 || overriddenAreas.length > 0)
+        "
+    >
+        <CardHeader>
+            <CardTitle>
+                Template inheritance: {{ templateState.templateName }}
+            </CardTitle>
+            <CardDescription>
+                Every setting area inherits independently. Local changes stay
+                unchanged when the template is updated until that area is reset.
+            </CardDescription>
+        </CardHeader>
+        <CardContent class="space-y-4">
+            <div class="flex flex-wrap gap-2">
+                <Badge
+                    v-for="area in inheritedAreas"
+                    :key="`inherited-${area.value}`"
+                    variant="outline"
+                >
+                    {{ area.label }} · inherited
+                </Badge>
+            </div>
+
+            <div
+                v-for="area in overriddenAreas"
+                :key="`overridden-${area.value}`"
+                class="space-y-3 rounded-lg border p-4"
+            >
+                <div class="flex flex-wrap items-center justify-between gap-3">
+                    <Badge>{{ area.label }} · template overridden</Badge>
+                    <Button
+                        type="button"
+                        size="sm"
+                        variant="outline"
+                        :disabled="form.processing || !canReset(area)"
+                        @click="resetArea(area)"
+                    >
+                        {{
+                            activeArea === area.value && form.processing
+                                ? 'Resetting…'
+                                : 'Reset to template'
+                        }}
+                    </Button>
+                </div>
+
+                <div
+                    v-if="area.value === 'ticket_statuses' && statusRequirement"
+                    class="space-y-3"
+                >
+                    <p class="text-muted-foreground text-sm">
+                        Choose where tickets in local statuses should move
+                        before those statuses are removed.
+                    </p>
+                    <div
+                        v-for="status in statusRequirement.removedStatuses"
+                        :key="status.id"
+                        class="grid gap-2 sm:grid-cols-2 sm:items-center"
+                    >
+                        <Label :for="`replacement-${status.id}`">
+                            {{ status.name }} ({{ status.ticketCount }} tickets)
+                        </Label>
+                        <div class="grid gap-1">
+                            <select
+                                :id="`replacement-${status.id}`"
+                                v-model="
+                                    form.status_replacements[String(status.id)]
+                                "
+                                class="border-input bg-background shadow-xs focus-visible:border-ring focus-visible:ring-ring/50 rounded-md border px-3 py-2 text-sm outline-none focus-visible:ring-[3px]"
+                            >
+                                <option :value="undefined" disabled>
+                                    Select replacement status
+                                </option>
+                                <option
+                                    v-for="option in statusRequirement.replacementOptions"
+                                    :key="option.id"
+                                    :value="option.id"
+                                >
+                                    {{ option.name }}
+                                </option>
+                            </select>
+                            <InputError
+                                :message="
+                                    form.errors[
+                                        `status_replacements.${status.id}`
+                                    ]
+                                "
+                            />
+                        </div>
+                    </div>
+                </div>
+
+                <InputError :message="form.errors.areas" />
+            </div>
+        </CardContent>
+    </Card>
+</template>

resources/js/pages/project-templates/Create.vue

@@ -0,0 +1,146 @@
+<script setup lang="ts">
+import { Head, Link, useForm } from '@inertiajs/vue3';
+import { computed } from 'vue';
+import Heading from '@/components/Heading.vue';
+import InputError from '@/components/InputError.vue';
+import { Badge } from '@/components/ui/badge';
+import { Button } from '@/components/ui/button';
+import {
+    Card,
+    CardContent,
+    CardDescription,
+    CardHeader,
+    CardTitle,
+} from '@/components/ui/card';
+import { Input } from '@/components/ui/input';
+import { Label } from '@/components/ui/label';
+import AppLayout from '@/layouts/AppLayout.vue';
+import { index as projectsIndex, show as projectShow } from '@/routes/projects/index';
+import {
+    create as projectTemplateCreate,
+    store as projectTemplateStore,
+} from '@/routes/projects/templates';
+import type { BreadcrumbItem, ProjectTemplatesCreatePageProps } from '@/types';
+
+const props = defineProps<ProjectTemplatesCreatePageProps>();
+
+const breadcrumbs: BreadcrumbItem[] = [
+    {
+        title: 'Projects',
+        href: projectsIndex(),
+    },
+    {
+        title: props.project.name,
+        href: projectShow(props.project.id),
+    },
+    {
+        title: 'Save as new template',
+        href: projectTemplateCreate(props.project.id),
+    },
+];
+
+const form = useForm({
+    copy_areas: props.copyAreaOptions.map((copyAreaOption) => copyAreaOption.value),
+    name: `${props.project.name} template`,
+    slug: `${props.project.key.toLowerCase()}-template`,
+});
+
+const copyAreasError = computed(() => {
+    return (
+        form.errors.copy_areas ??
+        Object.entries(form.errors).find(([key]) => key.startsWith('copy_areas.'))?.[1] ??
+        ''
+    );
+});
+
+const submit = (): void => {
+    form.post(projectTemplateStore.url(props.project.id), {
+        preserveScroll: true,
+    });
+};
+</script>
+
+<template>
+    <AppLayout :breadcrumbs="breadcrumbs">
+        <Head :title="`Save ${project.name} as new template`" />
+
+        <div class="mx-auto flex w-full max-w-3xl flex-1 flex-col gap-6 p-4">
+            <div class="space-y-3">
+                <Badge variant="outline" class="px-3 py-1">{{ project.key }}</Badge>
+                <Heading
+                    :title="`Save ${project.name} as new template`"
+                    description="Capture reusable project configuration without copying operational ticket data."
+                />
+            </div>
+
+            <Card>
+                <CardHeader>
+                    <CardTitle>Template details</CardTitle>
+                    <CardDescription>
+                        Pick the configuration groups that should be reusable in future projects.
+                    </CardDescription>
+                </CardHeader>
+
+                <CardContent>
+                    <form class="space-y-6" @submit.prevent="submit">
+                        <div class="grid gap-2">
+                            <Label for="name">Template name</Label>
+                            <Input id="name" v-model="form.name" required placeholder="Foundation template" />
+                            <InputError :message="form.errors.name" />
+                        </div>
+
+                        <div class="grid gap-2">
+                            <Label for="slug">Template slug</Label>
+                            <Input id="slug" v-model="form.slug" required placeholder="foundation-template" />
+                            <p class="text-muted-foreground text-sm">
+                                Slugs are normalized automatically and used to identify reusable templates.
+                            </p>
+                            <InputError :message="form.errors.slug" />
+                        </div>
+
+                        <div class="grid gap-3">
+                            <div>
+                                <Label>Configuration groups</Label>
+                                <p class="text-muted-foreground text-sm">
+                                    Only the selected groups will be stored in the template.
+                                </p>
+                            </div>
+
+                            <div class="grid gap-3">
+                                <Label
+                                    v-for="copyAreaOption in copyAreaOptions"
+                                    :key="copyAreaOption.value"
+                                    class="flex cursor-pointer items-start gap-3 rounded-xl border p-4"
+                                >
+                                    <input
+                                        v-model="form.copy_areas"
+                                        type="checkbox"
+                                        :value="copyAreaOption.value"
+                                        class="mt-1"
+                                    />
+                                    <div class="space-y-1">
+                                        <div class="font-medium">{{ copyAreaOption.label }}</div>
+                                        <p class="text-muted-foreground text-sm">
+                                            {{ copyAreaOption.description }}
+                                        </p>
+                                    </div>
+                                </Label>
+                            </div>
+                            <InputError :message="copyAreasError" />
+                        </div>
+
+                        <div class="flex items-center gap-3">
+                            <Button type="submit" :disabled="form.processing">
+                                Save new template
+                            </Button>
+
+                            <Button as-child variant="outline">
+                                <Link :href="projectShow(project.id)">Cancel</Link>
+                            </Button>
+                        </div>
+                    </form>
+                </CardContent>
+            </Card>
+        </div>
+    </AppLayout>
+</template>

resources/js/pages/project-templates/Edit.vue

@@ -0,0 +1,175 @@
+<script setup lang="ts">
+import { Head, Link, useForm } from '@inertiajs/vue3';
+import { computed } from 'vue';
+import Heading from '@/components/Heading.vue';
+import InputError from '@/components/InputError.vue';
+import { Badge } from '@/components/ui/badge';
+import { Button } from '@/components/ui/button';
+import {
+    Card,
+    CardContent,
+    CardDescription,
+    CardHeader,
+    CardTitle,
+} from '@/components/ui/card';
+import { Input } from '@/components/ui/input';
+import { Label } from '@/components/ui/label';
+import AppLayout from '@/layouts/AppLayout.vue';
+import {
+    edit as projectTemplatesEdit,
+    index as projectTemplatesIndex,
+    update as projectTemplatesUpdate,
+} from '@/routes/project-templates';
+import type { BreadcrumbItem, ProjectTemplatesEditPageProps } from '@/types';
+
+const props = defineProps<ProjectTemplatesEditPageProps>();
+
+const breadcrumbs: BreadcrumbItem[] = [
+    {
+        title: 'Project templates',
+        href: projectTemplatesIndex(),
+    },
+    {
+        title: props.template.name,
+        href: projectTemplatesEdit(props.template.id),
+    },
+];
+
+const form = useForm({
+    confirm_linked_projects_update: false,
+    copy_areas: [...props.template.copy_areas],
+    name: props.template.name,
+});
+
+const copyAreasError = computed(() => {
+    return (
+        form.errors.copy_areas ??
+        Object.entries(form.errors).find(([key]) => key.startsWith('copy_areas.'))?.[1] ??
+        ''
+    );
+});
+
+const linkedProjectCount = computed(() => props.template.linked_project_count ?? 0);
+
+const submit = (): void => {
+    form.patch(projectTemplatesUpdate.url(props.template.id), {
+        preserveScroll: true,
+    });
+};
+</script>
+
+<template>
+    <AppLayout :breadcrumbs="breadcrumbs">
+        <Head :title="`Edit ${template.name}`" />
+
+        <div class="mx-auto flex w-full max-w-3xl flex-1 flex-col gap-6 p-4">
+            <div class="space-y-3">
+                <div class="flex flex-wrap items-center gap-3">
+                    <Badge variant="outline" class="px-3 py-1">{{ template.slug }}</Badge>
+                    <Badge v-if="linkedProjectCount > 0" variant="secondary">
+                        {{ linkedProjectCount }} linked {{ linkedProjectCount === 1 ? 'project' : 'projects' }}
+                    </Badge>
+                </div>
+                <Heading
+                    :title="`Edit ${template.name}`"
+                    description="Refresh the template baseline from its source project while keeping immutable identifiers protected."
+                />
+            </div>
+
+            <Card>
+                <CardHeader>
+                    <CardTitle>Template details</CardTitle>
+                    <CardDescription>
+                        <template v-if="template.source_project">
+                            This template baseline is rebuilt from {{ template.source_project.name }} ({{ template.source_project.key }}) when you save.
+                        </template>
+                        <template v-else>
+                            This template baseline is rebuilt from its source project when you save.
+                        </template>
+                    </CardDescription>
+                </CardHeader>
+
+                <CardContent>
+                    <form class="space-y-6" @submit.prevent="submit">
+                        <div class="grid gap-2">
+                            <Label for="name">Template name</Label>
+                            <Input id="name" v-model="form.name" required placeholder="Foundation template" />
+                            <InputError :message="form.errors.name" />
+                        </div>
+
+                        <div class="grid gap-2">
+                            <Label for="slug">Template slug</Label>
+                            <Input id="slug" :model-value="template.slug" disabled />
+                            <p class="text-muted-foreground text-sm">
+                                The slug stays locked so existing template references remain stable.
+                            </p>
+                        </div>
+
+                        <div class="grid gap-3">
+                            <div>
+                                <Label>Configuration groups</Label>
+                                <p class="text-muted-foreground text-sm">
+                                    Saving rebuilds the selected groups from the current source-project configuration.
+                                </p>
+                            </div>
+
+                            <div class="grid gap-3">
+                                <Label
+                                    v-for="copyAreaOption in copyAreaOptions"
+                                    :key="copyAreaOption.value"
+                                    class="flex cursor-pointer items-start gap-3 rounded-xl border p-4"
+                                >
+                                    <input
+                                        v-model="form.copy_areas"
+                                        type="checkbox"
+                                        :value="copyAreaOption.value"
+                                        class="mt-1"
+                                    />
+                                    <div class="space-y-1">
+                                        <div class="font-medium">{{ copyAreaOption.label }}</div>
+                                        <p class="text-muted-foreground text-sm">
+                                            {{ copyAreaOption.description }}
+                                        </p>
+                                    </div>
+                                </Label>
+                            </div>
+                            <InputError :message="copyAreasError" />
+                        </div>
+
+                        <div
+                            v-if="linkedProjectCount > 0"
+                            class="space-y-3 rounded-xl border border-amber-300 bg-amber-50 p-4 text-amber-950 dark:border-amber-900/70 dark:bg-amber-950/40 dark:text-amber-100"
+                        >
+                            <div class="space-y-1">
+                                <div class="font-medium">Warning</div>
+                                <p class="text-sm">
+                                    Saving this template updates the baseline for {{ linkedProjectCount }} linked {{ linkedProjectCount === 1 ? 'project' : 'projects' }}.
+                                    Inherited areas will follow the new template version, while existing overrides stay untouched.
+                                </p>
+                            </div>
+
+                            <Label class="flex cursor-pointer items-start gap-3">
+                                <input v-model="form.confirm_linked_projects_update" type="checkbox" class="mt-1" />
+                                <span class="text-sm">
+                                    I understand that linked projects inheriting from this template will be affected.
+                                </span>
+                            </Label>
+
+                            <InputError :message="form.errors.confirm_linked_projects_update" />
+                        </div>
+
+                        <div class="flex items-center gap-3">
+                            <Button type="submit" :disabled="form.processing">
+                                Save template changes
+                            </Button>
+
+                            <Button as-child variant="outline">
+                                <Link :href="projectTemplatesIndex()">Cancel</Link>
+                            </Button>
+                        </div>
+                    </form>
+                </CardContent>
+            </Card>
+        </div>
+    </AppLayout>
+</template>

resources/js/pages/project-templates/Index.vue

@@ -0,0 +1,127 @@
+<script setup lang="ts">
+import { Head, Link, router } from '@inertiajs/vue3';
+import Heading from '@/components/Heading.vue';
+import { Badge } from '@/components/ui/badge';
+import { Button } from '@/components/ui/button';
+import {
+    Card,
+    CardContent,
+    CardDescription,
+    CardHeader,
+    CardTitle,
+} from '@/components/ui/card';
+import AppLayout from '@/layouts/AppLayout.vue';
+import {
+    destroy as projectTemplatesDestroy,
+    edit as projectTemplatesEdit,
+    index as projectTemplatesIndex,
+} from '@/routes/project-templates';
+import { create as projectsCreate, index as projectsIndex } from '@/routes/projects/index';
+import type { BreadcrumbItem, ProjectTemplatesIndexPageProps } from '@/types';
+
+const props = defineProps<ProjectTemplatesIndexPageProps>();
+
+const breadcrumbs: BreadcrumbItem[] = [
+    {
+        title: 'Project templates',
+        href: projectTemplatesIndex(),
+    },
+];
+
+const removeTemplate = (templateId: number): void => {
+    router.delete(projectTemplatesDestroy.url(templateId), {
+        preserveScroll: true,
+    });
+};
+</script>
+
+<template>
+    <AppLayout :breadcrumbs="breadcrumbs">
+        <Head title="Project templates" />
+
+        <div class="flex flex-1 flex-col gap-6 p-4">
+            <div class="flex flex-col gap-4 sm:flex-row sm:items-start sm:justify-between">
+                <Heading
+                    title="Project templates"
+                    description="Reusable published project templates. Internal project base templates stay hidden here by default."
+                />
+
+                <div class="flex flex-wrap gap-3">
+                    <Button as-child variant="outline">
+                        <Link :href="projectsIndex()">Back to projects</Link>
+                    </Button>
+
+                    <Button as-child>
+                        <Link :href="projectsCreate()">Create project</Link>
+                    </Button>
+                </div>
+            </div>
+
+            <div
+                v-if="status"
+                class="rounded-xl border border-emerald-200 bg-emerald-50 px-4 py-3 text-sm text-emerald-900 dark:border-emerald-900/70 dark:bg-emerald-950/40 dark:text-emerald-100"
+            >
+                {{ status }}
+            </div>
+
+            <div v-if="templates.length === 0" class="text-muted-foreground text-sm">
+                No published project templates have been saved yet.
+            </div>
+
+            <div v-else class="grid gap-4 md:grid-cols-2 xl:grid-cols-3">
+                <Card v-for="template in templates" :key="template.id" class="h-full">
+                    <CardHeader>
+                        <div class="flex flex-wrap items-center gap-2">
+                            <CardTitle>{{ template.name }}</CardTitle>
+                            <Badge variant="secondary">{{ template.slug }}</Badge>
+                            <Badge v-if="template.linked_project_count" variant="outline">
+                                {{ template.linked_project_count }} linked {{ template.linked_project_count === 1 ? 'project' : 'projects' }}
+                            </Badge>
+                        </div>
+                        <CardDescription>
+                            <template v-if="template.source_project">
+                                Saved from {{ template.source_project.name }} ({{ template.source_project.key }}).
+                            </template>
+                            <template v-else>
+                                Saved template configuration.
+                            </template>
+                        </CardDescription>
+                    </CardHeader>
+                    <CardContent class="space-y-4">
+                        <div class="flex flex-wrap gap-2">
+                            <Badge
+                                v-for="copyArea in template.copy_areas"
+                                :key="copyArea"
+                                variant="outline"
+                            >
+                                {{ copyArea }}
+                            </Badge>
+                        </div>
+
+                        <div class="flex flex-wrap gap-3">
+                            <Button as-child variant="secondary">
+                                <Link :href="projectTemplatesEdit(template.id)">
+                                    Edit
+                                </Link>
+                            </Button>
+
+                            <Button as-child variant="outline">
+                                <Link :href="projectsCreate({ query: { template: template.id } })">
+                                    Use template
+                                </Link>
+                            </Button>
+
+                            <Button
+                                type="button"
+                                variant="destructive"
+                                @click="removeTemplate(template.id)"
+                            >
+                                Delete
+                            </Button>
+                        </div>
+                    </CardContent>
+                </Card>
+            </div>
+        </div>
+    </AppLayout>
+</template>

resources/js/pages/projects/Create.vue

@@ -1,5 +1,6 @@
 <script setup lang="ts">
-import { Form, Head, Link } from '@inertiajs/vue3';
+import { Head, Link, useForm } from '@inertiajs/vue3';
+import { computed } from 'vue';
 import ProjectController from '@/actions/App/Http/Controllers/ProjectController';
 import Heading from '@/components/Heading.vue';
 import InputError from '@/components/InputError.vue';
@@ -15,7 +16,9 @@ import { Input } from '@/components/ui/input';
 import { Label } from '@/components/ui/label';
 import AppLayout from '@/layouts/AppLayout.vue';
 import { create, index } from '@/routes/projects/index';
-import type { BreadcrumbItem } from '@/types';
+import type { BreadcrumbItem, ProjectsCreatePageProps } from '@/types';
+
+const props = defineProps<ProjectsCreatePageProps>();
 
 const breadcrumbs: BreadcrumbItem[] = [
     {
@@ -27,6 +30,43 @@ const breadcrumbs: BreadcrumbItem[] = [
         href: create(),
     },
 ];
+
+const defaultTemplateId = props.selectedSourceTemplateId ?? props.sourceTemplates[0]?.id ?? null;
+
+const form = useForm({
+    copy_areas: [] as string[],
+    creation_mode: defaultTemplateId !== null ? 'template' : 'scratch',
+    key: '',
+    name: '',
+    source_project_id: props.sourceProjects[0]?.id ? String(props.sourceProjects[0].id) : '',
+    source_template_id: defaultTemplateId !== null ? String(defaultTemplateId) : '',
+});
+
+const hasSourceProjects = computed(() => props.sourceProjects.length > 0);
+const hasSourceTemplates = computed(() => props.sourceTemplates.length > 0);
+
+const copyAreasError = computed(() => {
+    return (
+        form.errors.copy_areas ??
+        Object.entries(form.errors).find(([key]) => key.startsWith('copy_areas.'))?.[1] ??
+        ''
+    );
+});
+
+const submit = (): void => {
+    if (form.creation_mode !== 'duplicate') {
+        form.source_project_id = '';
+        form.copy_areas = [];
+    }
+
+    if (form.creation_mode !== 'template') {
+        form.source_template_id = '';
+    }
+
+    form.post(ProjectController.store.url(), {
+        preserveScroll: true,
+    });
+};
 </script>
 
 <template>
@@ -36,7 +76,7 @@ const breadcrumbs: BreadcrumbItem[] = [
         <div class="mx-auto flex w-full max-w-3xl flex-1 flex-col gap-6 p-4">
             <Heading
                 title="Create project"
-                description="Create a project with a stable uppercase key that will prefix all future ticket keys."
+                description="Create a fresh project, duplicate selected settings from an existing project, or start from a saved template."
             />
 
             <Card>
@@ -49,28 +89,82 @@ const breadcrumbs: BreadcrumbItem[] = [
                 </CardHeader>
 
                 <CardContent>
-                    <Form
-                        v-bind="ProjectController.store.form()"
-                        class="space-y-6"
-                        v-slot="{ errors, processing }"
-                    >
+                    <form class="space-y-6" @submit.prevent="submit">
+                        <div class="grid gap-3">
+                            <Label>How do you want to start?</Label>
+                            <div class="grid gap-3 sm:grid-cols-3">
+                                <Label class="flex cursor-pointer items-start gap-3 rounded-xl border p-4">
+                                    <input
+                                        v-model="form.creation_mode"
+                                        type="radio"
+                                        value="scratch"
+                                        class="mt-1"
+                                    />
+                                    <div class="space-y-1">
+                                        <div class="font-medium">Create from scratch</div>
+                                        <p class="text-muted-foreground text-sm">
+                                            Start with the default project setup.
+                                        </p>
+                                    </div>
+                                </Label>
+
+                                <Label
+                                    class="flex items-start gap-3 rounded-xl border p-4"
+                                    :class="hasSourceProjects ? 'cursor-pointer' : 'cursor-not-allowed opacity-60'"
+                                >
+                                    <input
+                                        v-model="form.creation_mode"
+                                        type="radio"
+                                        value="duplicate"
+                                        class="mt-1"
+                                        :disabled="!hasSourceProjects"
+                                    />
+                                    <div class="space-y-1">
+                                        <div class="font-medium">Create from existing project</div>
+                                        <p class="text-muted-foreground text-sm">
+                                            Copy only the settings you explicitly select. Tickets are never duplicated.
+                                        </p>
+                                    </div>
+                                </Label>
+
+                                <Label
+                                    class="flex items-start gap-3 rounded-xl border p-4"
+                                    :class="hasSourceTemplates ? 'cursor-pointer' : 'cursor-not-allowed opacity-60'"
+                                >
+                                    <input
+                                        v-model="form.creation_mode"
+                                        type="radio"
+                                        value="template"
+                                        class="mt-1"
+                                        :disabled="!hasSourceTemplates"
+                                    />
+                                    <div class="space-y-1">
+                                        <div class="font-medium">Create from template</div>
+                                        <p class="text-muted-foreground text-sm">
+                                            Reuse a saved configuration template.
+                                        </p>
+                                    </div>
+                                </Label>
+                            </div>
+                        </div>
+
                         <div class="grid gap-2">
                             <Label for="name">Project name</Label>
                             <Input
                                 id="name"
-                                name="name"
+                                v-model="form.name"
                                 required
                                 autofocus
                                 placeholder="Kanban foundation"
                             />
-                            <InputError :message="errors.name" />
+                            <InputError :message="form.errors.name" />
                         </div>
 
                         <div class="grid gap-2">
                             <Label for="key">Project key</Label>
                             <Input
                                 id="key"
-                                name="key"
+                                v-model="form.key"
                                 required
                                 maxlength="5"
                                 placeholder="CORE"
@@ -78,15 +172,111 @@ const breadcrumbs: BreadcrumbItem[] = [
                             />
                             <p class="text-muted-foreground text-sm">
                                 Example ticket keys will look like
-                                <span class="text-foreground font-medium"
-                                    >CORE-1</span
-                                >.
+                                <span class="text-foreground font-medium">CORE-1</span>.
                             </p>
-                            <InputError :message="errors.key" />
+                            <InputError :message="form.errors.key" />
+                        </div>
+
+                        <div
+                            v-if="form.creation_mode === 'duplicate'"
+                            class="space-y-6 rounded-xl border border-dashed p-4"
+                        >
+                            <div class="grid gap-2">
+                                <Label for="source_project_id">Source project</Label>
+                                <select
+                                    id="source_project_id"
+                                    v-model="form.source_project_id"
+                                    class="border-input bg-background ring-offset-background placeholder:text-muted-foreground focus-visible:ring-ring flex h-10 w-full rounded-md border px-3 py-2 text-sm focus-visible:ring-2 focus-visible:ring-offset-2 focus-visible:outline-none disabled:cursor-not-allowed disabled:opacity-50"
+                                    :disabled="!hasSourceProjects"
+                                >
+                                    <option value="">Select a source project</option>
+                                    <option
+                                        v-for="sourceProject in sourceProjects"
+                                        :key="sourceProject.id"
+                                        :value="String(sourceProject.id)"
+                                    >
+                                        {{ sourceProject.name }} ({{ sourceProject.key }})
+                                    </option>
+                                </select>
+                                <p class="text-muted-foreground text-sm">
+                                    The new project keeps its own identity, key, and future ticket numbering.
+                                </p>
+                                <InputError :message="form.errors.source_project_id" />
+                            </div>
+
+                            <div class="grid gap-3">
+                                <div>
+                                    <Label>Copy options</Label>
+                                    <p class="text-muted-foreground text-sm">
+                                        Choose which settings should be copied into the new project.
+                                    </p>
+                                </div>
+
+                                <div class="grid gap-3">
+                                    <Label
+                                        v-for="copyAreaOption in copyAreaOptions"
+                                        :key="copyAreaOption.value"
+                                        class="flex cursor-pointer items-start gap-3 rounded-xl border p-4"
+                                    >
+                                        <input
+                                            v-model="form.copy_areas"
+                                            type="checkbox"
+                                            :value="copyAreaOption.value"
+                                            class="mt-1"
+                                        />
+                                        <div class="space-y-1">
+                                            <div class="font-medium">{{ copyAreaOption.label }}</div>
+                                            <p class="text-muted-foreground text-sm">
+                                                {{ copyAreaOption.description }}
+                                            </p>
+                                        </div>
+                                    </Label>
+                                </div>
+
+                                <p class="text-muted-foreground text-sm">
+                                    Operational ticket data is always left behind so the new project starts clean.
+                                </p>
+                                <InputError :message="copyAreasError" />
+                            </div>
+                        </div>
+
+                        <div
+                            v-else-if="form.creation_mode === 'template'"
+                            class="space-y-4 rounded-xl border border-dashed p-4"
+                        >
+                            <div class="grid gap-2">
+                                <Label for="source_template_id">Template</Label>
+                                <select
+                                    id="source_template_id"
+                                    v-model="form.source_template_id"
+                                    class="border-input bg-background ring-offset-background placeholder:text-muted-foreground focus-visible:ring-ring flex h-10 w-full rounded-md border px-3 py-2 text-sm focus-visible:ring-2 focus-visible:ring-offset-2 focus-visible:outline-none disabled:cursor-not-allowed disabled:opacity-50"
+                                    :disabled="!hasSourceTemplates"
+                                >
+                                    <option value="">Select a template</option>
+                                    <option
+                                        v-for="sourceTemplate in sourceTemplates"
+                                        :key="sourceTemplate.id"
+                                        :value="String(sourceTemplate.id)"
+                                    >
+                                        {{ sourceTemplate.name }} ({{ sourceTemplate.slug }})
+                                    </option>
+                                </select>
+                                <p class="text-muted-foreground text-sm">
+                                    Templates apply their saved configuration groups to the new project.
+                                </p>
+                                <InputError :message="form.errors.source_template_id" />
+                            </div>
+                        </div>
+
+                        <div
+                            v-else-if="!hasSourceProjects && !hasSourceTemplates"
+                            class="text-muted-foreground text-sm"
+                        >
+                            No accessible source projects or saved templates are available yet.
                         </div>
 
                         <div class="flex items-center gap-3">
-                            <Button type="submit" :disabled="processing">
+                            <Button type="submit" :disabled="form.processing">
                                 Create project
                             </Button>
 
@@ -94,7 +284,7 @@ const breadcrumbs: BreadcrumbItem[] = [
                                 <Link :href="index()">Cancel</Link>
                             </Button>
                         </div>
-                    </Form>
+                    </form>
                 </CardContent>
             </Card>
         </div>

resources/js/pages/projects/Show.vue

@@ -22,6 +22,7 @@ import {
     notifications as notificationSettings,
     repositories as repositorySettings,
 } from '@/routes/projects/settings';
+import { create as projectTemplateCreate } from '@/routes/projects/templates';
 import type { BreadcrumbItem, ProjectShowPageProps } from '@/types';
 
 const props = defineProps<ProjectShowPageProps>();
@@ -94,12 +95,48 @@ const projectAreas = [
                         </Link>
                     </Button>
 
+                    <Button
+                        v-if="$page.props.auth.permissions.projectCreate"
+                        as-child
+                        variant="outline"
+                    >
+                        <Link :href="projectTemplateCreate(project.id)">
+                            Save as new template
+                        </Link>
+                    </Button>
+
                     <Button as-child variant="outline">
                         <Link :href="index()">Back to projects</Link>
                     </Button>
                 </div>
             </div>
 
+            <Card v-if="templateState?.inheritsFromTemplate">
+                <CardHeader>
+                    <CardTitle>
+                        Built from template {{ templateState.templateName }}
+                    </CardTitle>
+                    <CardDescription>
+                        This project keeps its template link. Inherited areas follow the template baseline; overridden areas were customized locally.
+                    </CardDescription>
+                </CardHeader>
+                <CardContent class="flex flex-wrap gap-2">
+                    <Badge
+                        v-for="area in templateState.inheritedAreas"
+                        :key="`inherited-${area.value}`"
+                        variant="outline"
+                    >
+                        {{ area.label }} · inherited
+                    </Badge>
+                    <Badge
+                        v-for="area in templateState.overriddenAreas"
+                        :key="`overridden-${area.value}`"
+                    >
+                        {{ area.label }} · overridden
+                    </Badge>
+                </CardContent>
+            </Card>
+
             <div v-if="canManageAccess" class="flex flex-wrap gap-3">
                 <Button as-child>
                     <Link :href="boardSettings(project.id)">

resources/js/pages/projects/settings/Board.vue

@@ -3,6 +3,7 @@ import { Form, Head, Link } from '@inertiajs/vue3';
 import ProjectBoardSettingsController from '@/actions/App/Http/Controllers/ProjectBoardSettingsController';
 import Heading from '@/components/Heading.vue';
 import InputError from '@/components/InputError.vue';
+import TemplateInheritancePanel from '@/components/projects/TemplateInheritancePanel.vue';
 import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
 import {
@@ -138,6 +139,16 @@ const statusAllowsTarget = (
                 {{ status }}
             </div>
 
+            <TemplateInheritancePanel
+                :areas="[
+                    'board_columns',
+                    'ticket_statuses',
+                    'status_transitions',
+                ]"
+                :project-id="project.id"
+                :template-state="templateState"
+            />
+
             <Card>
                 <CardHeader>
                     <CardTitle>Workflow model</CardTitle>

resources/js/pages/projects/settings/General.vue

@@ -43,20 +43,58 @@ const breadcrumbs: BreadcrumbItem[] = [
     },
 ];
 
+const switchTemplateForm = useForm({
+    confirmation_key: '',
+    source_template_id: props.sourceTemplates.find(
+        (template) => template.id !== props.project.project_template_id,
+    )?.id,
+});
+
 const deleteForm = useForm({
     confirmation_key: '',
 });
 
+const availableSwitchTemplates = computed(() =>
+    props.sourceTemplates.filter(
+        (template) => template.id !== props.project.project_template_id,
+    ),
+);
+
+const currentTemplate = computed(() => props.project.project_template ?? null);
+
+const isSwitchConfirmationValid = computed(
+    () => switchTemplateForm.confirmation_key === props.project.key,
+);
+
+const canSwitchTemplate = computed(
+    () =>
+        isSwitchConfirmationValid.value &&
+        switchTemplateForm.source_template_id !== undefined,
+);
+
 const isDeleteConfirmationValid = computed(
     () => deleteForm.confirmation_key === props.project.key,
 );
 
+const submitSwitchTemplate = (): void => {
+    if (!canSwitchTemplate.value) {
+        return;
+    }
+
+    switchTemplateForm.post(
+        ProjectController.switchTemplate.url(props.project.id),
+        {
+            preserveScroll: true,
+        },
+    );
+};
+
 const submitDelete = (): void => {
     if (!isDeleteConfirmationValid.value) {
         return;
     }
 
-    deleteForm.submit(ProjectController.destroy(props.project.id), {
+    deleteForm.delete(ProjectController.destroy.url(props.project.id), {
         preserveScroll: true,
     });
 };
@@ -152,6 +190,153 @@ const submitDelete = (): void => {
                 </CardContent>
             </Card>
 
+            <Card>
+                <CardHeader>
+                    <CardTitle>Template baseline</CardTitle>
+                    <CardDescription>
+                        Switch this project to another published template. Use
+                        the inheritance panels to reset individual settings to
+                        the currently linked template.
+                    </CardDescription>
+                </CardHeader>
+
+                <CardContent class="space-y-6">
+                    <div class="grid gap-4 md:grid-cols-2">
+                        <div class="border-border/70 rounded-xl border p-4">
+                            <p
+                                class="text-muted-foreground text-xs font-semibold uppercase tracking-[0.18em]"
+                            >
+                                Current linked template
+                            </p>
+                            <p
+                                class="text-foreground mt-2 text-sm font-semibold"
+                            >
+                                {{
+                                    currentTemplate?.name ??
+                                    'No linked template'
+                                }}
+                            </p>
+                            <p class="text-muted-foreground mt-2 text-sm">
+                                {{
+                                    templateState?.inheritsFromTemplate
+                                        ? 'Inherited and overridden areas stay visible after switching.'
+                                        : 'This project currently behaves like a standalone baseline.'
+                                }}
+                            </p>
+                        </div>
+
+                        <div class="border-border/70 rounded-xl border p-4">
+                            <p
+                                class="text-muted-foreground text-xs font-semibold uppercase tracking-[0.18em]"
+                            >
+                                Warning
+                            </p>
+                            <p class="text-foreground mt-2 text-sm font-medium">
+                                Switching templates can replace inherited board
+                                workflow, ticket metadata, repositories, and
+                                notifications.
+                            </p>
+                            <p class="text-muted-foreground mt-2 text-sm">
+                                Confirm each action with the exact project key
+                                to avoid accidental overwrites.
+                            </p>
+                        </div>
+                    </div>
+
+                    <div class="grid gap-6">
+                        <form
+                            class="space-y-4 rounded-xl border p-4"
+                            @submit.prevent="submitSwitchTemplate"
+                        >
+                            <div class="space-y-1">
+                                <h3 class="text-sm font-semibold">
+                                    Switch to another template
+                                </h3>
+                                <p class="text-muted-foreground text-sm">
+                                    Applying a different template replaces the
+                                    copied areas with that template's current
+                                    baseline.
+                                </p>
+                            </div>
+
+                            <div class="grid gap-2">
+                                <Label for="source_template_id"
+                                    >Published template</Label
+                                >
+                                <select
+                                    id="source_template_id"
+                                    v-model="
+                                        switchTemplateForm.source_template_id
+                                    "
+                                    :disabled="
+                                        switchTemplateForm.processing ||
+                                        availableSwitchTemplates.length === 0
+                                    "
+                                    class="border-input bg-background shadow-xs focus-visible:border-ring focus-visible:ring-ring/50 rounded-md border px-3 py-2 text-sm outline-none transition-[color,box-shadow] focus-visible:ring-[3px]"
+                                >
+                                    <option :value="undefined" disabled>
+                                        Select a template
+                                    </option>
+                                    <option
+                                        v-for="template in availableSwitchTemplates"
+                                        :key="template.id"
+                                        :value="template.id"
+                                    >
+                                        {{ template.name }}
+                                    </option>
+                                </select>
+                                <InputError
+                                    :message="
+                                        switchTemplateForm.errors
+                                            .source_template_id
+                                    "
+                                />
+                            </div>
+
+                            <div class="grid gap-2">
+                                <Label for="switch_confirmation_key"
+                                    >Confirmation key</Label
+                                >
+                                <Input
+                                    id="switch_confirmation_key"
+                                    v-model="
+                                        switchTemplateForm.confirmation_key
+                                    "
+                                    :disabled="switchTemplateForm.processing"
+                                    placeholder="Type the project key exactly"
+                                />
+                                <InputError
+                                    :message="
+                                        switchTemplateForm.errors
+                                            .confirmation_key
+                                    "
+                                />
+                            </div>
+
+                            <div
+                                class="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between"
+                            >
+                                <p class="text-muted-foreground text-sm">
+                                    Existing project-specific configuration in
+                                    copied areas may be replaced or removed.
+                                </p>
+
+                                <Button
+                                    type="submit"
+                                    variant="outline"
+                                    :disabled="
+                                        switchTemplateForm.processing ||
+                                        !canSwitchTemplate
+                                    "
+                                >
+                                    Switch template
+                                </Button>
+                            </div>
+                        </form>
+                    </div>
+                </CardContent>
+            </Card>
+
             <Card
                 class="border-red-200/80 bg-red-50/60 dark:border-red-900/60 dark:bg-red-950/20"
             >

resources/js/pages/projects/settings/Metadata.vue

@@ -3,6 +3,7 @@ import { Form, Head, Link } from '@inertiajs/vue3';
 import ProjectTicketMetadataSettingsController from '@/actions/App/Http/Controllers/ProjectTicketMetadataSettingsController';
 import Heading from '@/components/Heading.vue';
 import InputError from '@/components/InputError.vue';
+import TemplateInheritancePanel from '@/components/projects/TemplateInheritancePanel.vue';
 import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
 import {
@@ -115,6 +116,18 @@ const replacementTicketTypes = (ticketTypeId: number) =>
                 {{ status }}
             </div>
 
+            <TemplateInheritancePanel
+                :areas="[
+                    'project_settings',
+                    'ticket_types',
+                    'ticket_priorities',
+                    'ticket_fields',
+                    'ticket_link_types',
+                ]"
+                :project-id="project.id"
+                :template-state="templateState"
+            />
+
             <div class="grid gap-6 xl:grid-cols-2">
                 <Card class="gap-0 overflow-hidden">
                     <CardHeader class="border-b">
@@ -673,7 +686,9 @@ const replacementTicketTypes = (ticketTypeId: number) =>
                                     required
                                     placeholder="Blocked by"
                                 />
-                                <InputError :message="errors.counterpart_name" />
+                                <InputError
+                                    :message="errors.counterpart_name"
+                                />
                             </div>
 
                             <Button type="submit" :disabled="processing">
@@ -719,7 +734,9 @@ const replacementTicketTypes = (ticketTypeId: number) =>
                                     <Input
                                         :id="`link-type-counterpart-name-${ticketLinkType.id}`"
                                         name="counterpart_name"
-                                        :default-value="ticketLinkType.counterpart_label"
+                                        :default-value="
+                                            ticketLinkType.counterpart_label
+                                        "
                                         required
                                     />
                                     <InputError

resources/js/pages/projects/settings/Notifications.vue

@@ -4,6 +4,7 @@ import { computed, reactive } from 'vue';
 import ProjectNotificationSettingsController from '@/actions/App/Http/Controllers/ProjectNotificationSettingsController';
 import Heading from '@/components/Heading.vue';
 import InputError from '@/components/InputError.vue';
+import TemplateInheritancePanel from '@/components/projects/TemplateInheritancePanel.vue';
 import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
 import {
@@ -89,7 +90,8 @@ const breadcrumbs: BreadcrumbItem[] = [
 
 let filterStateCounter = 0;
 
-const nextFilterStateId = (): string => `notification-filter-${filterStateCounter++}`;
+const nextFilterStateId = (): string =>
+    `notification-filter-${filterStateCounter++}`;
 
 const parseInFilterValues = (value: string): string[] =>
     value
@@ -100,7 +102,8 @@ const parseInFilterValues = (value: string): string[] =>
 const supportsFilterValue = (operator: string): boolean =>
     !['exists', 'not_exists'].includes(operator);
 
-const supportsArrayFilterValue = (operator: string): boolean => operator === 'in';
+const supportsArrayFilterValue = (operator: string): boolean =>
+    operator === 'in';
 
 const createFilter = (): NotificationFilterFormState => ({
     attribute: defaultFilterAttribute,
@@ -159,8 +162,9 @@ const resetCreateFilters = (): void => {
     createFilterState.filters = [];
 };
 
-const editFilters = (notificationActionId: number): NotificationFilterFormState[] =>
-    editFilterState[notificationActionId] ?? [];
+const editFilters = (
+    notificationActionId: number,
+): NotificationFilterFormState[] => editFilterState[notificationActionId] ?? [];
 
 const addEditFilter = (notificationActionId: number): void => {
     editFilterState[notificationActionId] = [
@@ -169,10 +173,13 @@ const addEditFilter = (notificationActionId: number): void => {
     ];
 };
 
-const removeEditFilter = (notificationActionId: number, index: number): void => {
-    editFilterState[notificationActionId] = editFilters(notificationActionId).filter(
-        (_, candidateIndex) => candidateIndex !== index,
-    );
+const removeEditFilter = (
+    notificationActionId: number,
+    index: number,
+): void => {
+    editFilterState[notificationActionId] = editFilters(
+        notificationActionId,
+    ).filter((_, candidateIndex) => candidateIndex !== index);
 };
 
 const createSerializedFilters = computed<string>(() =>
@@ -305,6 +312,12 @@ const notificationActionTimestamp = (
                 {{ status }}
             </div>
 
+            <TemplateInheritancePanel
+                :areas="['notification_actions']"
+                :project-id="project.id"
+                :template-state="templateState"
+            />
+
             <div class="grid gap-6 xl:grid-cols-[24rem_minmax(0,1fr)]">
                 <div class="space-y-6">
                     <Card>
@@ -517,7 +530,10 @@ const notificationActionTimestamp = (
                                     />
 
                                     <div
-                                        v-if="createFilterState.filters.length === 0"
+                                        v-if="
+                                            createFilterState.filters.length ===
+                                            0
+                                        "
                                         class="text-muted-foreground text-sm"
                                     >
                                         No filters configured. This action runs
@@ -526,8 +542,7 @@ const notificationActionTimestamp = (
 
                                     <div
                                         v-for="(
-                                            filter,
-                                            filterIndex
+                                            filter, filterIndex
                                         ) in createFilterState.filters"
                                         :key="filter.id"
                                         class="grid gap-3 rounded-md border p-3"
@@ -546,8 +561,12 @@ const notificationActionTimestamp = (
                                                 >
                                                     <option
                                                         v-for="filterAttributeOption in filterAttributeOptions"
-                                                        :key="filterAttributeOption.value"
-                                                        :value="filterAttributeOption.value"
+                                                        :key="
+                                                            filterAttributeOption.value
+                                                        "
+                                                        :value="
+                                                            filterAttributeOption.value
+                                                        "
                                                     >
                                                         {{
                                                             filterAttributeOption.label
@@ -569,8 +588,12 @@ const notificationActionTimestamp = (
                                                 >
                                                     <option
                                                         v-for="filterOperatorOption in filterOperatorOptions"
-                                                        :key="filterOperatorOption.value"
-                                                        :value="filterOperatorOption.value"
+                                                        :key="
+                                                            filterOperatorOption.value
+                                                        "
+                                                        :value="
+                                                            filterOperatorOption.value
+                                                        "
                                                     >
                                                         {{
                                                             filterOperatorOption.label
@@ -581,7 +604,11 @@ const notificationActionTimestamp = (
                                         </div>
 
                                         <div
-                                            v-if="supportsFilterValue(filter.operator)"
+                                            v-if="
+                                                supportsFilterValue(
+                                                    filter.operator,
+                                                )
+                                            "
                                             class="grid gap-2"
                                         >
                                             <Label
@@ -636,7 +663,9 @@ const notificationActionTimestamp = (
                                     </div>
 
                                     <InputError
-                                        :message="notificationFilterError(errors)"
+                                        :message="
+                                            notificationFilterError(errors)
+                                        "
                                     />
                                 </div>
 
@@ -1003,8 +1032,7 @@ const notificationActionTimestamp = (
 
                                     <div
                                         v-for="(
-                                            filter,
-                                            filterIndex
+                                            filter, filterIndex
                                         ) in editFilters(notificationAction.id)"
                                         :key="filter.id"
                                         class="grid gap-3 rounded-md border p-3"
@@ -1023,8 +1051,12 @@ const notificationActionTimestamp = (
                                                 >
                                                     <option
                                                         v-for="filterAttributeOption in filterAttributeOptions"
-                                                        :key="filterAttributeOption.value"
-                                                        :value="filterAttributeOption.value"
+                                                        :key="
+                                                            filterAttributeOption.value
+                                                        "
+                                                        :value="
+                                                            filterAttributeOption.value
+                                                        "
                                                     >
                                                         {{
                                                             filterAttributeOption.label
@@ -1046,8 +1078,12 @@ const notificationActionTimestamp = (
                                                 >
                                                     <option
                                                         v-for="filterOperatorOption in filterOperatorOptions"
-                                                        :key="filterOperatorOption.value"
-                                                        :value="filterOperatorOption.value"
+                                                        :key="
+                                                            filterOperatorOption.value
+                                                        "
+                                                        :value="
+                                                            filterOperatorOption.value
+                                                        "
                                                     >
                                                         {{
                                                             filterOperatorOption.label
@@ -1058,7 +1094,11 @@ const notificationActionTimestamp = (
                                         </div>
 
                                         <div
-                                            v-if="supportsFilterValue(filter.operator)"
+                                            v-if="
+                                                supportsFilterValue(
+                                                    filter.operator,
+                                                )
+                                            "
                                             class="grid gap-2"
                                         >
                                             <Label
@@ -1118,7 +1158,9 @@ const notificationActionTimestamp = (
                                     </div>
 
                                     <InputError
-                                        :message="notificationFilterError(errors)"
+                                        :message="
+                                            notificationFilterError(errors)
+                                        "
                                     />
                                 </div>
 

resources/js/pages/projects/settings/Repositories.vue

@@ -4,6 +4,7 @@ import { computed, watch } from 'vue';
 import ProjectRepositorySettingsController from '@/actions/App/Http/Controllers/ProjectRepositorySettingsController';
 import Heading from '@/components/Heading.vue';
 import InputError from '@/components/InputError.vue';
+import TemplateInheritancePanel from '@/components/projects/TemplateInheritancePanel.vue';
 import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
 import {
@@ -277,6 +278,12 @@ const submitUpdate = (): void => {
                 {{ status }}
             </div>
 
+            <TemplateInheritancePanel
+                :areas="['repository_connections']"
+                :project-id="project.id"
+                :template-state="templateState"
+            />
+
             <Card>
                 <CardHeader>
                     <CardTitle>Personal Git access</CardTitle>
@@ -294,9 +301,9 @@ const submitUpdate = (): void => {
                         </Link>
                     </Button>
                     <p class="text-muted-foreground text-sm">
-                        Without a matching personal connection, {{ appName }} only
-                        shows the repository name and links you to your user
-                        settings.
+                        Without a matching personal connection,
+                        {{ appName }} only shows the repository name and links
+                        you to your user settings.
                     </p>
                 </CardContent>
             </Card>
@@ -621,8 +628,8 @@ const submitUpdate = (): void => {
                                 >
                                     This project link is visible, but you need a
                                     matching Git connection in your user
-                                    settings before {{ appName }} can open or query
-                                    this repository for you.
+                                    settings before {{ appName }} can open or
+                                    query this repository for you.
                                 </p>
 
                                 <div class="mt-4 flex justify-end">
@@ -657,9 +664,9 @@ const submitUpdate = (): void => {
                         <CardHeader class="border-b">
                             <CardTitle>Detected personal sources</CardTitle>
                             <CardDescription>
-                                {{ appName }} loads repositories from your personal
-                                Git connections and offers them for project
-                                linking.
+                                {{ appName }} loads repositories from your
+                                personal Git connections and offers them for
+                                project linking.
                             </CardDescription>
                         </CardHeader>
 

resources/js/types/models/project-model.ts

@@ -1,7 +1,11 @@
+import type { ProjectTemplateModel } from '@/types/models/project-template-model';
+
 export type ProjectModel = {
     id: number;
     name: string;
     key: string;
+    project_template_id?: number | null;
+    project_template?: ProjectTemplateModel | null;
     show_author: boolean;
     show_story_points: boolean;
     created_at: string;

resources/js/types/models/project-template-model.ts

@@ -0,0 +1,16 @@
+import type { ProjectModel } from '@/types/models/project-model';
+
+export type ProjectTemplateModel = {
+    id: number;
+    is_published: boolean;
+    project_id: number | null;
+    source_project_id: number | null;
+    source_project: ProjectModel | null;
+    name: string;
+    slug: string;
+    copy_areas: string[];
+    configuration_snapshot: Record<string, unknown>;
+    linked_project_count?: number;
+    created_at: string | null;
+    updated_at: string | null;
+};

resources/js/types/page-props.ts

@@ -4,6 +4,7 @@ import type { NotificationActionModel } from '@/types/models/notification-action
 import type { NotificationActionOptionModel } from '@/types/models/notification-action-option-model';
 import type { NotificationActionTemplateVariableModel } from '@/types/models/notification-action-template-variable-model';
 import type { ProjectModel } from '@/types/models/project-model';
+import type { ProjectTemplateModel } from '@/types/models/project-template-model';
 import type { RepositoryConnectionModel } from '@/types/models/repository-connection-model';
 import type { TeamModel } from '@/types/models/team-model';
 import type { TicketFieldDefinitionModel } from '@/types/models/ticket-field-definition-model';
@@ -32,14 +33,72 @@ export type AdminUserEditPageProps = {
     user: UserModel;
 };
 
+export type ProjectDuplicateCopyAreaOption = {
+    description: string;
+    label: string;
+    value: string;
+};
+
 export type ProjectsIndexPageProps = {
     projects: ProjectModel[];
     status?: string | null;
 };
 
+export type ProjectsCreatePageProps = {
+    copyAreaOptions: ProjectDuplicateCopyAreaOption[];
+    selectedSourceTemplateId?: number | null;
+    sourceProjects: ProjectModel[];
+    sourceTemplates: ProjectTemplateModel[];
+};
+
+export type ProjectTemplatesIndexPageProps = {
+    status?: string | null;
+    templates: ProjectTemplateModel[];
+};
+
+export type ProjectTemplatesCreatePageProps = {
+    copyAreaOptions: ProjectDuplicateCopyAreaOption[];
+    project: ProjectModel;
+};
+
+export type ProjectTemplatesEditPageProps = {
+    copyAreaOptions: ProjectDuplicateCopyAreaOption[];
+    template: ProjectTemplateModel;
+};
+
+export type ProjectTemplateStateArea = {
+    label: string;
+    value: string;
+};
+
+export type ProjectTemplateState = {
+    effectiveConfiguration: Record<string, unknown>;
+    inheritedAreas: ProjectTemplateStateArea[];
+    inheritedConfiguration?: Record<string, unknown>;
+    inheritsFromTemplate: boolean;
+    overriddenAreas: ProjectTemplateStateArea[];
+    overriddenConfiguration?: Record<string, unknown>;
+    resetRequirements?: Record<
+        string,
+        {
+            removedStatuses: Array<{
+                id: number;
+                name: string;
+                ticketCount: number;
+            }>;
+            replacementOptions: Array<{ id: number; name: string }>;
+        }
+    >;
+    templateConfiguration?: Record<string, unknown>;
+    templateId: number;
+    templateName: string;
+    templateSlug: string;
+};
+
 export type ProjectShowPageProps = {
     canManageAccess: boolean;
     project: ProjectModel;
+    templateState?: ProjectTemplateState | null;
 };
 
 export type PermissionOption = {
@@ -71,12 +130,15 @@ export type ProjectBoardSettingsPageProps = {
     boardColumns: BoardColumnModel[];
     project: ProjectModel;
     status?: string | null;
+    templateState?: ProjectTemplateState | null;
     ticketStatuses: TicketStatusModel[];
 };
 
 export type ProjectGeneralSettingsPageProps = {
     project: ProjectModel;
+    sourceTemplates: ProjectTemplateModel[];
     status?: string | null;
+    templateState?: ProjectTemplateState | null;
 };
 
 export type ProjectBoardPageProps = {
@@ -97,6 +159,7 @@ export type ProjectTicketMetadataSettingsPageProps = {
     project: ProjectModel;
     error?: boolean;
     status?: string | null;
+    templateState?: ProjectTemplateState | null;
     ticketFieldDefinitions: TicketFieldDefinitionModel[];
     ticketLinkTypes: TicketLinkTypeModel[];
     ticketPriorities: TicketPriorityModel[];
@@ -108,6 +171,7 @@ export type ProjectRepositorySettingsPageProps = {
     project: ProjectModel;
     repositoryConnections: RepositoryConnectionModel[];
     status?: string | null;
+    templateState?: ProjectTemplateState | null;
 };
 
 export type ProjectNotificationSettingsPageProps = {
@@ -119,6 +183,7 @@ export type ProjectNotificationSettingsPageProps = {
     notificationActions: NotificationActionModel[];
     project: ProjectModel;
     status?: string | null;
+    templateState?: ProjectTemplateState | null;
     templateVariables: NotificationActionTemplateVariableModel[];
 };
 

routes/web.php

@@ -20,6 +20,7 @@ Route::middleware(['auth', 'verified'])->group(function () {
     Route::inertia('dashboard', 'Dashboard')->name('dashboard');
 
     require __DIR__.'/web/admin.php';
+    require __DIR__.'/web/project-templates.php';
     require __DIR__.'/web/projects.php';
     require __DIR__.'/web/teams.php';
 });

routes/web/project-templates.php

@@ -0,0 +1,14 @@
+<?php
+
+use App\Http\Controllers\ProjectTemplateController;
+use Illuminate\Support\Facades\Route;
+
+Route::middleware('can:create-project')
+    ->prefix('project-templates')
+    ->name('project-templates.')
+    ->group(function (): void {
+        Route::get('/', [ProjectTemplateController::class, 'index'])->name('index');
+        Route::get('{projectTemplate}/edit', [ProjectTemplateController::class, 'edit'])->name('edit');
+        Route::patch('{projectTemplate}', [ProjectTemplateController::class, 'update'])->name('update');
+        Route::delete('{projectTemplate}', [ProjectTemplateController::class, 'destroy'])->name('destroy');
+    });

routes/web/project/settings.php

@@ -8,6 +8,8 @@ use App\Http\Controllers\ProjectTicketMetadataSettingsController;
 use Illuminate\Support\Facades\Route;
 
 Route::get('general', [ProjectController::class, 'general'])->name('general');
+Route::post('general/switch-template', [ProjectController::class, 'switchTemplate'])->name('general.switch-template');
+Route::post('general/reset-template', [ProjectController::class, 'resetTemplate'])->name('general.reset-template');
 
 Route::get('board', [ProjectBoardSettingsController::class, 'show'])->name('board');
 

routes/web/projects.php

@@ -2,6 +2,7 @@
 
 use App\Http\Controllers\ProjectBoardController;
 use App\Http\Controllers\ProjectController;
+use App\Http\Controllers\ProjectTemplateController;
 use Illuminate\Support\Facades\Route;
 
 Route::prefix('projects')->name('projects.')->group(function (): void {
@@ -18,6 +19,11 @@ Route::prefix('projects')->name('projects.')->group(function (): void {
                 Route::get('/', [ProjectController::class, 'show'])->name('show');
                 Route::get('board', [ProjectBoardController::class, 'index'])->name('board.index');
                 Route::get('backlog', [ProjectController::class, 'backlog'])->name('backlog.index');
+
+                Route::middleware('can:create-project')->group(function (): void {
+                    Route::get('templates/create', [ProjectTemplateController::class, 'create'])->name('templates.create');
+                    Route::post('templates', [ProjectTemplateController::class, 'store'])->name('templates.store');
+                });
             });
 
             Route::delete('/', [ProjectController::class, 'destroy'])

tests/Feature/Api/ProjectApiTest.php

@@ -2,8 +2,13 @@
 
 namespace Tests\Feature\Api;
 
+use App\Actions\Projects\DuplicateProjectConfiguration;
 use App\Actions\ProjectTicketMetadata\InitializeProjectTicketMetadata;
+use App\Models\BoardColumn;
 use App\Models\Project;
+use App\Models\ProjectTemplate;
+use App\Models\TicketStatus;
+use App\Models\TicketType;
 use App\Models\User;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Tests\TestCase;
@@ -38,6 +43,7 @@ class ProjectApiTest extends TestCase
 
         $this->withApplicationKey($user)
             ->postJson(route('api.projects.store'), [
+                'creation_mode' => 'scratch',
                 'key' => 'api',
                 'name' => 'API Project',
             ])
@@ -47,8 +53,221 @@ class ProjectApiTest extends TestCase
             ->assertJsonPath('meta.message', 'API Project was created.');
 
         $project = Project::query()->where('key', 'API')->firstOrFail();
+        $project->refresh();
+
         $this->assertSame(2, $project->ticketTypes()->count());
         $this->assertSame(1, $project->ticketStatuses()->count());
+        $this->assertNotNull($project->project_template_id);
+    }
+
+    public function test_users_can_create_projects_from_templates_via_api(): void
+    {
+        $user = User::factory()->create();
+        $this->syncGlobalPermissions($user, ['create']);
+
+        $template = ProjectTemplate::factory()->create([
+            'name' => 'API Template',
+            'slug' => 'api-template',
+            'copy_areas' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+            ],
+            'configuration_snapshot' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS => [
+                    'show_author' => false,
+                    'show_story_points' => false,
+                ],
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES => [
+                    [
+                        'name' => 'Spike',
+                        'position' => 1,
+                        'is_parent' => false,
+                    ],
+                ],
+            ],
+        ]);
+
+        $this->withApplicationKey($user)
+            ->postJson(route('api.projects.store'), [
+                'key' => 'tpl1',
+                'name' => 'Template API Project',
+                'creation_mode' => 'template',
+                'source_template_id' => $template->id,
+            ])
+            ->assertCreated()
+            ->assertJsonPath('data.key', 'TPL1')
+            ->assertJsonPath('data.name', 'Template API Project');
+
+        $project = Project::query()->where('key', 'TPL1')->firstOrFail();
+
+        $project->refresh();
+
+        $this->assertSame($template->id, $project->project_template_id);
+        $this->assertDatabaseMissing('project_templates', [
+            'project_id' => $project->id,
+            'is_published' => false,
+        ]);
+        $this->assertFalse($project->show_author);
+        $this->assertFalse($project->show_story_points);
+        $this->assertSame(['Spike'], $project->ticketTypes()->pluck('name')->all());
+        $this->assertDatabaseHas('ticket_types', [
+            'project_id' => $project->id,
+            'project_template_id' => $template->id,
+            'name' => 'Spike',
+        ]);
+    }
+
+    public function test_project_api_exposes_template_context_and_overrides(): void
+    {
+        $user = User::factory()->create();
+        $project = Project::factory()->create([
+            'key' => 'TMP1',
+            'name' => 'Template Driven Project',
+            'show_author' => false,
+            'show_story_points' => false,
+        ]);
+        $template = ProjectTemplate::factory()->create([
+            'name' => 'Workflow Template',
+            'slug' => 'workflow-template',
+            'copy_areas' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+            ],
+            'configuration_snapshot' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS => [
+                    'show_author' => true,
+                    'show_story_points' => true,
+                ],
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES => [
+                    [
+                        'name' => 'Bug',
+                        'position' => 1,
+                        'is_parent' => false,
+                    ],
+                    [
+                        'name' => 'Feature',
+                        'position' => 2,
+                        'is_parent' => false,
+                    ],
+                ],
+            ],
+        ]);
+
+        $project->update([
+            'project_template_id' => $template->id,
+        ]);
+        $project->ticketTypes()->delete();
+        TicketType::factory()->create([
+            'project_id' => $project->id,
+            'name' => 'Bug',
+            'position' => 1,
+            'is_parent' => false,
+        ]);
+        TicketType::factory()->create([
+            'project_id' => $project->id,
+            'name' => 'Feature',
+            'position' => 2,
+            'is_parent' => false,
+        ]);
+        $project->forceFill([
+            'template_overrides' => [DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS],
+        ])->saveQuietly();
+
+        $this->syncProjectPermissions($project, $user, ['view']);
+
+        $this->withApplicationKey($user)
+            ->getJson(route('api.projects.show', $project))
+            ->assertOk()
+            ->assertJsonPath('data.project_template.id', $template->id)
+            ->assertJsonPath('data.project_template.slug', 'workflow-template')
+            ->assertJsonPath('data.project_template.configuration_snapshot.project_settings.show_author', true)
+            ->assertJsonPath('data.template_state.inherits_from_template', true)
+            ->assertJsonPath('data.template_state.template_id', $template->id)
+            ->assertJsonPath('data.template_state.template_configuration.project_settings.show_author', true)
+            ->assertJsonPath('data.template_state.effective_configuration.ticket_types.0.name', 'Bug')
+            ->assertJsonPath('data.template_state.inherited_configuration.ticket_types.1.name', 'Feature')
+            ->assertJsonPath('data.template_state.overridden_configuration.project_settings.show_author', false)
+            ->assertJsonPath('data.template_state.overridden_areas.0.value', DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS);
+    }
+
+    public function test_users_can_duplicate_projects_via_api(): void
+    {
+        $user = User::factory()->create();
+        $this->syncGlobalPermissions($user, ['create']);
+
+        $sourceProject = Project::factory()->create([
+            'key' => 'SRC1',
+            'show_author' => false,
+        ]);
+        $this->syncProjectPermissions($sourceProject, $user, ['view']);
+
+        $sourceProject->ticketTypes()->delete();
+        $sourceProject->ticketStatuses()->delete();
+        $sourceProject->boardColumns()->delete();
+
+        $column = BoardColumn::factory()->create([
+            'project_id' => $sourceProject->id,
+            'name' => 'In Progress',
+            'position' => 1,
+        ]);
+        $backlogStatus = TicketStatus::factory()->create([
+            'project_id' => $sourceProject->id,
+            'name' => 'Queued',
+            'position' => 1,
+        ]);
+        $activeStatus = TicketStatus::factory()->create([
+            'project_id' => $sourceProject->id,
+            'board_column_id' => $column->id,
+            'name' => 'Active',
+            'position' => 1,
+        ]);
+        $backlogStatus->allowedTargetStatuses()->sync([$activeStatus->id]);
+        TicketType::factory()->create([
+            'project_id' => $sourceProject->id,
+            'name' => 'Spike',
+            'position' => 1,
+        ]);
+
+        $this->withApplicationKey($user)
+            ->postJson(route('api.projects.store'), [
+                'key' => 'dup2',
+                'name' => 'Duplicated API Project',
+                'creation_mode' => 'duplicate',
+                'source_project_id' => $sourceProject->id,
+                'copy_areas' => [
+                    DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                    DuplicateProjectConfiguration::COPY_BOARD_WORKFLOW,
+                    DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+                ],
+            ])
+            ->assertCreated()
+            ->assertJsonPath('data.key', 'DUP2')
+            ->assertJsonPath('data.name', 'Duplicated API Project');
+
+        $project = Project::query()->where('key', 'DUP2')->firstOrFail();
+
+        $this->assertFalse($project->show_author);
+        $this->assertSame(['In Progress'], $project->boardColumns()->pluck('name')->all());
+        $this->assertSame(['Queued', 'Active'], $project->ticketStatuses()->pluck('name')->all());
+        $this->assertSame(['Spike'], $project->ticketTypes()->pluck('name')->all());
+        $this->assertSame(['Active'], $project->ticketStatuses()->where('name', 'Queued')->firstOrFail()->allowedTargetStatuses()->pluck('name')->all());
+    }
+
+    public function test_project_duplication_via_api_requires_visible_source_project(): void
+    {
+        $user = User::factory()->create();
+        $this->syncGlobalPermissions($user, ['create']);
+        $sourceProject = Project::factory()->create();
+
+        $this->withApplicationKey($user)
+            ->postJson(route('api.projects.store'), [
+                'key' => 'nope',
+                'name' => 'No Access',
+                'creation_mode' => 'duplicate',
+                'source_project_id' => $sourceProject->id,
+            ])
+            ->assertStatus(422)
+            ->assertJsonValidationErrors(['source_project_id']);
     }
 
     public function test_project_show_and_delete_enforce_permissions(): void

tests/Feature/Database/ProjectTemplateBaselineMigrationTest.php

@@ -0,0 +1,195 @@
+<?php
+
+namespace Tests\Feature\Database;
+
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use Illuminate\Support\Facades\Artisan;
+use Illuminate\Support\Facades\DB;
+use Tests\TestCase;
+
+class ProjectTemplateBaselineMigrationTest extends TestCase
+{
+    public function test_migration_backfills_hidden_base_templates_for_existing_projects(): void
+    {
+        Artisan::call('migrate:fresh', [
+            '--path' => [
+                'database/migrations/0001_01_01_000000_create_users_table.php',
+                'database/migrations/0001_01_01_000001_create_cache_table.php',
+                'database/migrations/0001_01_01_000002_create_jobs_table.php',
+                'database/migrations/2025_08_14_170933_add_two_factor_columns_to_users_table.php',
+                'database/migrations/2026_03_24_234007_create_projects_table.php',
+                'database/migrations/2026_03_24_234734_create_teams_table.php',
+                'database/migrations/2026_03_24_234735_create_team_user_table.php',
+                'database/migrations/2026_03_25_002100_create_board_columns_table.php',
+                'database/migrations/2026_03_25_003100_create_ticket_types_table.php',
+                'database/migrations/2026_03_25_003101_create_ticket_priorities_table.php',
+                'database/migrations/2026_03_25_003102_create_ticket_field_definitions_table.php',
+                'database/migrations/2026_03_25_004098_create_ticket_statuses_table.php',
+                'database/migrations/2026_03_25_004099_create_ticket_statuses_transitionstable.php',
+                'database/migrations/2026_03_25_004100_create_tickets_table.php',
+                'database/migrations/2026_03_25_065302_create_ticket_worklog_entries_table.php',
+                'database/migrations/2026_03_25_070706_create_ticket_field_values_table.php',
+                'database/migrations/2026_03_25_073715_create_ticket_links_table.php',
+                'database/migrations/2026_03_25_073715_create_ticket_link_types_table.php',
+                'database/migrations/2026_03_26_074522_create_user_git_connections_table.php',
+                'database/migrations/2026_03_26_075849_create_repository_connections_table.php',
+                'database/migrations/2026_04_12_120000_create_permission_assignments_table.php',
+                'database/migrations/2026_04_20_174556_create_user_applications_table.php',
+                'database/migrations/2026_04_20_194646_create_notification_actions_table.php',
+                'database/migrations/2026_04_20_194646_create_notification_delivery_logs_table.php',
+                'database/migrations/2026_04_24_194800_add_filters_to_notification_actions_table.php',
+                'database/migrations/2026_04_24_203500_create_acceptance_criteria_table.php',
+                'database/migrations/2026_05_19_230500_drop_acceptance_criteria_from_tickets_table.php',
+                'database/migrations/2026_05_22_124700_add_must_change_password_on_next_login_to_users_table.php',
+                'database/migrations/2026_05_23_101900_add_counterpart_label_to_ticket_link_types_table.php',
+                'database/migrations/2026_05_25_011500_create_project_templates_table.php',
+            ],
+        ]);
+
+        DB::table('projects')->insert([
+            'name' => 'Legacy Project',
+            'key' => 'LGCY',
+            'show_author' => 0,
+            'show_story_points' => 1,
+            'created_at' => now(),
+            'updated_at' => now(),
+        ]);
+
+        $projectId = (int) DB::table('projects')->where('key', 'LGCY')->value('id');
+
+        Artisan::call('migrate', [
+            '--path' => 'database/migrations/2026_05_25_013000_project_templates_as_project_baselines.php',
+        ]);
+
+        $project = DB::table('projects')->where('id', $projectId)->first();
+        $template = DB::table('project_templates')->where('id', $project->project_template_id)->first();
+
+        $this->assertNotNull($project->project_template_id);
+        $this->assertNotNull($template);
+        $this->assertSame($projectId, $template->project_id);
+        $this->assertSame($projectId, $template->source_project_id);
+        $this->assertSame(0, $template->is_published);
+        $this->assertSame('lgcy-base-template', $template->slug);
+    }
+
+    public function test_metadata_migration_moves_existing_configuration_and_preserves_published_template_links(): void
+    {
+        Artisan::call('migrate:fresh', [
+            '--path' => [
+                'database/migrations/0001_01_01_000000_create_users_table.php',
+                'database/migrations/0001_01_01_000001_create_cache_table.php',
+                'database/migrations/0001_01_01_000002_create_jobs_table.php',
+                'database/migrations/2025_08_14_170933_add_two_factor_columns_to_users_table.php',
+                'database/migrations/2026_03_24_234007_create_projects_table.php',
+                'database/migrations/2026_03_24_234734_create_teams_table.php',
+                'database/migrations/2026_03_24_234735_create_team_user_table.php',
+                'database/migrations/2026_03_25_002100_create_board_columns_table.php',
+                'database/migrations/2026_03_25_003100_create_ticket_types_table.php',
+                'database/migrations/2026_03_25_003101_create_ticket_priorities_table.php',
+                'database/migrations/2026_03_25_003102_create_ticket_field_definitions_table.php',
+                'database/migrations/2026_03_25_004098_create_ticket_statuses_table.php',
+                'database/migrations/2026_03_25_004099_create_ticket_statuses_transitionstable.php',
+                'database/migrations/2026_03_25_004100_create_tickets_table.php',
+                'database/migrations/2026_03_25_065302_create_ticket_worklog_entries_table.php',
+                'database/migrations/2026_03_25_070706_create_ticket_field_values_table.php',
+                'database/migrations/2026_03_25_073715_create_ticket_links_table.php',
+                'database/migrations/2026_03_25_073715_create_ticket_link_types_table.php',
+                'database/migrations/2026_03_26_074522_create_user_git_connections_table.php',
+                'database/migrations/2026_03_26_075849_create_repository_connections_table.php',
+                'database/migrations/2026_04_12_120000_create_permission_assignments_table.php',
+                'database/migrations/2026_04_20_174556_create_user_applications_table.php',
+                'database/migrations/2026_04_20_194646_create_notification_actions_table.php',
+                'database/migrations/2026_04_20_194646_create_notification_delivery_logs_table.php',
+                'database/migrations/2026_04_24_194800_add_filters_to_notification_actions_table.php',
+                'database/migrations/2026_04_24_203500_create_acceptance_criteria_table.php',
+                'database/migrations/2026_05_19_230500_drop_acceptance_criteria_from_tickets_table.php',
+                'database/migrations/2026_05_22_124700_add_must_change_password_on_next_login_to_users_table.php',
+                'database/migrations/2026_05_23_101900_add_counterpart_label_to_ticket_link_types_table.php',
+                'database/migrations/2026_05_25_011500_create_project_templates_table.php',
+                'database/migrations/2026_05_25_013000_project_templates_as_project_baselines.php',
+            ],
+        ]);
+
+        DB::table('projects')->insert([
+            'name' => 'Legacy Project',
+            'key' => 'LGCY',
+            'show_author' => 0,
+            'show_story_points' => 1,
+            'project_template_id' => null,
+            'created_at' => now(),
+            'updated_at' => now(),
+        ]);
+
+        $projectId = (int) DB::table('projects')->where('key', 'LGCY')->value('id');
+
+        DB::table('ticket_types')->insert([
+            'project_id' => $projectId,
+            'name' => 'Bug',
+            'position' => 1,
+            'is_parent' => 0,
+            'created_at' => now(),
+            'updated_at' => now(),
+        ]);
+
+        DB::table('projects')->insert([
+            'name' => 'Linked Project',
+            'key' => 'LINK',
+            'show_author' => 1,
+            'show_story_points' => 0,
+            'project_template_id' => null,
+            'created_at' => now(),
+            'updated_at' => now(),
+        ]);
+
+        $linkedProjectId = (int) DB::table('projects')->where('key', 'LINK')->value('id');
+        $publishedSnapshot = [
+            DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS => [
+                'show_author' => false,
+                'show_story_points' => true,
+            ],
+        ];
+        $publishedTemplateId = DB::table('project_templates')->insertGetId([
+            'project_id' => null,
+            'source_project_id' => $projectId,
+            'name' => 'Published Template',
+            'slug' => 'published-template',
+            'is_published' => true,
+            'copy_areas' => json_encode(
+                [DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS],
+                JSON_THROW_ON_ERROR,
+            ),
+            'configuration_snapshot' => json_encode($publishedSnapshot, JSON_THROW_ON_ERROR),
+            'created_at' => now(),
+            'updated_at' => now(),
+        ]);
+
+        DB::table('projects')->where('id', $linkedProjectId)->update([
+            'project_template_id' => $publishedTemplateId,
+        ]);
+
+        Artisan::call('migrate', [
+            '--path' => 'database/migrations/2026_06_05_161500_move_project_metadata_to_project_templates.php',
+        ]);
+
+        $project = DB::table('projects')->where('id', $projectId)->first();
+        $template = DB::table('project_templates')->where('id', $project->project_template_id)->first();
+        $ticketType = DB::table('ticket_types')->where('project_id', $projectId)->first();
+        $snapshot = json_decode((string) $template->configuration_snapshot, true, 512, JSON_THROW_ON_ERROR);
+
+        $this->assertSame($project->project_template_id, $ticketType->project_template_id);
+        $this->assertSame(['Bug'], array_column($snapshot[DuplicateProjectConfiguration::COPY_TICKET_TYPES], 'name'));
+        $this->assertSame(
+            $publishedTemplateId,
+            DB::table('projects')->where('id', $linkedProjectId)->value('project_template_id'),
+        );
+        $this->assertSame(
+            $publishedSnapshot,
+            json_decode(
+                (string) DB::table('project_templates')->where('id', $publishedTemplateId)->value('configuration_snapshot'),
+                true,
+                512,
+                JSON_THROW_ON_ERROR,
+            ),
+        );
+    }
+}

tests/Feature/Mcp/KanbanGitMcpTest.php

@@ -3,6 +3,7 @@
 namespace Tests\Feature\Mcp;
 
 use App\Actions\Notifications\DeliverNotificationAction;
+use App\Actions\Projects\DuplicateProjectConfiguration;
 use App\Actions\ProjectTicketMetadata\InitializeProjectTicketMetadata;
 use App\Enums\NotificationDeliveryStatus;
 use App\Mcp\Servers\KanbanGitServer;
@@ -15,8 +16,10 @@ use App\Mcp\Tools\UpdateTicketDescription;
 use App\Models\BoardColumn;
 use App\Models\NotificationAction;
 use App\Models\Project;
+use App\Models\ProjectTemplate;
 use App\Models\Ticket;
 use App\Models\TicketStatus;
+use App\Models\TicketType;
 use App\Models\User;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Illuminate\Support\Facades\Queue;
@@ -207,6 +210,69 @@ class KanbanGitMcpTest extends TestCase
                 ->etc());
     }
 
+    public function test_get_ticket_exposes_project_template_context_and_overrides(): void
+    {
+        $user = User::factory()->create();
+        $project = $this->project('CORE', 'Core project');
+        $template = ProjectTemplate::factory()->create([
+            'name' => 'Agent Workflow Template',
+            'slug' => 'agent-workflow-template',
+            'copy_areas' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+            ],
+            'configuration_snapshot' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS => [
+                    'show_author' => true,
+                    'show_story_points' => true,
+                ],
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES => [
+                    [
+                        'name' => 'Bug',
+                        'position' => 1,
+                        'is_parent' => false,
+                    ],
+                ],
+            ],
+        ]);
+        $project->update([
+            'project_template_id' => $template->id,
+            'show_author' => false,
+            'show_story_points' => false,
+        ]);
+        $project->ticketTypes()->delete();
+        TicketType::factory()->create([
+            'project_id' => $project->id,
+            'name' => 'Bug',
+            'position' => 1,
+            'is_parent' => false,
+        ]);
+        $project->forceFill([
+            'template_overrides' => [DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS],
+        ])->saveQuietly();
+        $status = $project->ticketStatuses()->firstOrFail();
+        $ticket = $this->ticket($project, $status, [
+            'ticket_key' => 'CORE-1',
+            'title' => 'Template aware ticket',
+        ]);
+
+        $this->syncProjectPermissions($project, $user, ['view']);
+
+        KanbanGitServer::actingAs($user)
+            ->tool(GetTicket::class, [
+                'ticket_id' => $ticket->id,
+            ])
+            ->assertOk()
+            ->assertStructuredContent(fn (AssertableJson $json) => $json
+                ->where('data.project.project_template.id', $template->id)
+                ->where('data.project.project_template.slug', 'agent-workflow-template')
+                ->where('data.project.template_state.inherits_from_template', true)
+                ->where('data.project.template_state.template_configuration.project_settings.show_author', true)
+                ->where('data.project.template_state.overridden_configuration.project_settings.show_author', false)
+                ->where('data.project.template_state.effective_configuration.ticket_types.0.name', 'Bug')
+                ->etc());
+    }
+
     public function test_description_update_requires_write_permission_and_preserves_unrelated_fields(): void
     {
         $user = User::factory()->create();

tests/Feature/Projects/ProjectBoardControllerTest.php

@@ -5,6 +5,7 @@ namespace Tests\Feature\Projects;
 use App\Actions\ProjectTicketMetadata\InitializeProjectTicketMetadata;
 use App\Models\BoardColumn;
 use App\Models\Project;
+use App\Models\ProjectTemplate;
 use App\Models\Ticket;
 use App\Models\TicketPriority;
 use App\Models\TicketStatus;
@@ -272,6 +273,9 @@ class ProjectBoardControllerTest extends TestCase
         $user = User::factory()->create();
         $project = Project::factory()->create();
         $otherProject = Project::factory()->create();
+        $sharedTemplate = ProjectTemplate::factory()->create();
+        $project->forceFill(['project_template_id' => $sharedTemplate->id])->saveQuietly();
+        $otherProject->forceFill(['project_template_id' => $sharedTemplate->id])->saveQuietly();
 
         app(InitializeProjectTicketMetadata::class)->handle($project);
         app(InitializeProjectTicketMetadata::class)->handle($otherProject);

tests/Feature/Projects/ProjectBoardSettingsControllerTest.php

@@ -2,9 +2,11 @@
 
 namespace Tests\Feature\Projects;
 
+use App\Actions\Projects\DuplicateProjectConfiguration;
 use App\Actions\ProjectTicketMetadata\InitializeProjectTicketMetadata;
 use App\Models\BoardColumn;
 use App\Models\Project;
+use App\Models\ProjectTemplate;
 use App\Models\Ticket;
 use App\Models\TicketStatus;
 use App\Models\User;
@@ -31,6 +33,15 @@ class ProjectBoardSettingsControllerTest extends TestCase
             'position' => 1,
         ]);
 
+        $template = ProjectTemplate::factory()->create([
+            'configuration_snapshot' => app(DuplicateProjectConfiguration::class)->export($project, [
+                DuplicateProjectConfiguration::COPY_BOARD_WORKFLOW,
+            ]),
+            'copy_areas' => [DuplicateProjectConfiguration::COPY_BOARD_WORKFLOW],
+            'name' => 'Starter Workflow',
+        ]);
+        $project->update(['project_template_id' => $template->id]);
+
         $this->syncProjectPermissions($project, $user, ['edit']);
 
         $this->actingAs($user)
@@ -41,7 +52,11 @@ class ProjectBoardSettingsControllerTest extends TestCase
                 ->where('project.id', $project->id)
                 ->where('backlogTicketStatuses.0.name', 'Backlog')
                 ->where('boardColumns.0.name', 'Todo')
-                ->where('ticketStatuses.0.name', 'Backlog'),
+                ->where('ticketStatuses.0.name', 'Backlog')
+                ->where('templateState.templateName', 'Starter Workflow')
+                ->where('templateState.inheritedAreas.0.value', DuplicateProjectConfiguration::COPY_BOARD_COLUMNS)
+                ->where('templateState.inheritedAreas.1.value', DuplicateProjectConfiguration::COPY_TICKET_STATUSES)
+                ->where('templateState.inheritedAreas.2.value', DuplicateProjectConfiguration::COPY_STATUS_TRANSITIONS),
             );
     }
 
@@ -295,6 +310,9 @@ class ProjectBoardSettingsControllerTest extends TestCase
         $otherProject = Project::factory()->create([
             'key' => 'EXT',
         ]);
+        $sharedTemplate = ProjectTemplate::factory()->create();
+        $project->forceFill(['project_template_id' => $sharedTemplate->id])->saveQuietly();
+        $otherProject->forceFill(['project_template_id' => $sharedTemplate->id])->saveQuietly();
         $this->syncProjectPermissions($project, $user, ['edit']);
 
         $sourceStatus = TicketStatus::factory()->for($project)->create([

tests/Feature/Projects/ProjectControllerTest.php

@@ -2,12 +2,20 @@
 
 namespace Tests\Feature\Projects;
 
+use App\Actions\Projects\DuplicateProjectConfiguration;
 use App\Actions\ProjectTicketMetadata\InitializeProjectTicketMetadata;
 use App\Models\BoardColumn;
+use App\Models\NotificationAction;
 use App\Models\Project;
+use App\Models\ProjectTemplate;
+use App\Models\RepositoryConnection;
 use App\Models\Team;
 use App\Models\Ticket;
+use App\Models\TicketFieldDefinition;
+use App\Models\TicketLinkType;
+use App\Models\TicketPriority;
 use App\Models\TicketStatus;
+use App\Models\TicketType;
 use App\Models\User;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Inertia\Testing\AssertableInertia as Assert;
@@ -100,12 +108,40 @@ class ProjectControllerTest extends TestCase
     {
         $user = User::factory()->create();
         $this->syncGlobalPermissions($user, ['project:create']);
+        $visibleProject = Project::factory()->create([
+            'name' => 'Visible Source',
+            'key' => 'SRC1',
+        ]);
+        Project::factory()->create([
+            'name' => 'Hidden Source',
+            'key' => 'SRC2',
+        ]);
+        $template = ProjectTemplate::factory()->create([
+            'name' => 'Reusable Setup',
+            'slug' => 'reusable-setup',
+            'source_project_id' => $visibleProject->id,
+        ]);
+        ProjectTemplate::factory()->create([
+            'name' => 'Hidden Base',
+            'slug' => 'hidden-base',
+            'project_id' => $visibleProject->id,
+            'source_project_id' => $visibleProject->id,
+            'is_published' => false,
+        ]);
+        $this->syncProjectPermissions($visibleProject, $user, ['view']);
 
         $this->actingAs($user)
-            ->get(route('projects.create'))
+            ->get(route('projects.create', ['template' => $template->id]))
             ->assertOk()
             ->assertInertia(fn (Assert $page) => $page
-                ->component('projects/Create'),
+                ->component('projects/Create')
+                ->has('copyAreaOptions', count(DuplicateProjectConfiguration::copyableAreas()))
+                ->has('sourceProjects', 1)
+                ->has('sourceTemplates', 1)
+                ->where('sourceProjects.0.id', $visibleProject->id)
+                ->where('sourceTemplates.0.id', $template->id)
+                ->where('selectedSourceTemplateId', $template->id)
+                ->where('copyAreaOptions.0.value', DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS),
             );
     }
 
@@ -131,6 +167,7 @@ class ProjectControllerTest extends TestCase
 
         $response = $this->actingAs($user)
             ->post(route('projects.store'), [
+                'creation_mode' => 'scratch',
                 'name' => 'Kanban Foundation',
                 'key' => 'core',
             ]);
@@ -144,6 +181,18 @@ class ProjectControllerTest extends TestCase
             'key' => 'CORE',
         ]);
 
+        $project->refresh();
+
+        $this->assertNotNull($project->project_template_id);
+
+        $this->assertDatabaseHas('project_templates', [
+            'id' => $project->project_template_id,
+            'project_id' => $project->id,
+            'source_project_id' => $project->id,
+            'is_published' => false,
+            'slug' => 'core-base-template',
+        ]);
+
         $this->assertDatabaseHas('permission_assignments', [
             'assignee_id' => $user->id,
             'assignee_type' => $user->getMorphClass(),
@@ -187,6 +236,222 @@ class ProjectControllerTest extends TestCase
             ->assertRedirect(route('projects.create'));
     }
 
+    public function test_authenticated_users_can_create_projects_from_saved_templates(): void
+    {
+        $user = User::factory()->create();
+        $this->syncGlobalPermissions($user, ['project:create']);
+
+        $sourceProject = Project::factory()->create([
+            'key' => 'SRC1',
+            'name' => 'Source Project',
+            'show_author' => false,
+            'show_story_points' => false,
+        ]);
+
+        $template = ProjectTemplate::factory()->create([
+            'source_project_id' => $sourceProject->id,
+            'name' => 'Kanban Template',
+            'slug' => 'kanban-template',
+            'copy_areas' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+            ],
+            'configuration_snapshot' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS => [
+                    'show_author' => false,
+                    'show_story_points' => false,
+                ],
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES => [
+                    [
+                        'name' => 'Bug',
+                        'position' => 1,
+                        'is_parent' => false,
+                    ],
+                ],
+            ],
+        ]);
+
+        $response = $this->actingAs($user)
+            ->post(route('projects.store'), [
+                'creation_mode' => 'template',
+                'name' => 'Template Based Project',
+                'key' => 'TMP1',
+                'source_template_id' => $template->id,
+            ]);
+
+        $project = Project::query()->where('key', 'TMP1')->firstOrFail();
+
+        $response->assertRedirect(route('projects.show', $project));
+
+        $project->refresh();
+
+        $this->assertSame($template->id, $project->project_template_id);
+        $this->assertDatabaseMissing('project_templates', [
+            'project_id' => $project->id,
+            'is_published' => false,
+        ]);
+        $this->assertSame(false, $project->show_author);
+        $this->assertSame(false, $project->show_story_points);
+        $this->assertDatabaseHas('ticket_types', [
+            'project_id' => $project->id,
+            'project_template_id' => $template->id,
+            'name' => 'Bug',
+            'position' => 1,
+            'is_parent' => false,
+        ]);
+        $this->assertDatabaseMissing('tickets', [
+            'project_id' => $project->id,
+        ]);
+    }
+
+    public function test_authenticated_users_can_duplicate_projects_with_selected_settings_only(): void
+    {
+        $user = User::factory()->create();
+        $this->syncGlobalPermissions($user, ['project:create']);
+
+        $sourceProject = Project::factory()->create([
+            'key' => 'SRC1',
+            'name' => 'Source Project',
+            'show_author' => false,
+            'show_story_points' => false,
+        ]);
+        $this->syncProjectPermissions($sourceProject, $user, ['view']);
+
+        $sourceProject->ticketTypes()->delete();
+        $sourceProject->ticketPriorities()->delete();
+        $sourceProject->ticketStatuses()->delete();
+        $sourceProject->boardColumns()->delete();
+
+        $todoColumn = BoardColumn::factory()->create([
+            'project_id' => $sourceProject->id,
+            'name' => 'Todo',
+            'position' => 1,
+        ]);
+        $doingColumn = BoardColumn::factory()->create([
+            'project_id' => $sourceProject->id,
+            'name' => 'Doing',
+            'position' => 2,
+        ]);
+
+        $backlogStatus = TicketStatus::factory()->create([
+            'project_id' => $sourceProject->id,
+            'board_column_id' => null,
+            'name' => 'Planned',
+            'position' => 1,
+        ]);
+        $todoStatus = TicketStatus::factory()->create([
+            'project_id' => $sourceProject->id,
+            'board_column_id' => $todoColumn->id,
+            'name' => 'Todo',
+            'position' => 1,
+        ]);
+        $doingStatus = TicketStatus::factory()->create([
+            'project_id' => $sourceProject->id,
+            'board_column_id' => $doingColumn->id,
+            'name' => 'Doing',
+            'position' => 1,
+        ]);
+        $todoStatus->allowedTargetStatuses()->sync([$doingStatus->id]);
+        $backlogStatus->allowedTargetStatuses()->sync([$todoStatus->id]);
+
+        TicketType::factory()->create([
+            'project_id' => $sourceProject->id,
+            'name' => 'Bug',
+            'position' => 1,
+        ]);
+        TicketType::factory()->create([
+            'project_id' => $sourceProject->id,
+            'name' => 'Epic',
+            'position' => 2,
+            'is_parent' => true,
+        ]);
+        TicketPriority::factory()->create([
+            'project_id' => $sourceProject->id,
+            'name' => 'Urgent',
+            'position' => 1,
+        ]);
+        TicketFieldDefinition::factory()->create([
+            'project_id' => $sourceProject->id,
+            'field_type' => 'number',
+            'label' => 'Story estimate',
+            'position' => 1,
+        ]);
+        TicketLinkType::factory()->create([
+            'project_id' => $sourceProject->id,
+            'label' => 'Blocks',
+            'counterpart_label' => 'Blocked by',
+            'position' => 1,
+        ]);
+        RepositoryConnection::factory()->create([
+            'project_id' => $sourceProject->id,
+            'repository_full_name' => 'OpenSource/source-project',
+        ]);
+        NotificationAction::factory()->create([
+            'project_id' => $sourceProject->id,
+            'name' => 'Notify board changes',
+        ]);
+        Ticket::factory()->create([
+            'project_id' => $sourceProject->id,
+            'sequence_number' => 42,
+            'title' => 'Existing ticket',
+        ]);
+
+        $response = $this->actingAs($user)
+            ->post(route('projects.store'), [
+                'name' => 'Duplicated Project',
+                'key' => 'dupe',
+                'creation_mode' => 'duplicate',
+                'source_project_id' => $sourceProject->id,
+                'copy_areas' => [
+                    DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                    DuplicateProjectConfiguration::COPY_BOARD_WORKFLOW,
+                    DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+                    DuplicateProjectConfiguration::COPY_TICKET_FIELDS,
+                ],
+            ]);
+
+        $response->assertRedirect()->assertSessionHasNoErrors();
+
+        $project = Project::query()->where('key', 'DUPE')->firstOrFail();
+
+        $response->assertRedirect(route('projects.show', $project));
+
+        $this->assertSame('Duplicated Project', $project->name);
+        $this->assertFalse($project->show_author);
+        $this->assertFalse($project->show_story_points);
+        $this->assertSame(0, $project->tickets()->count());
+
+        $this->assertSame(['Todo', 'Doing'], $project->boardColumns()->pluck('name')->all());
+        $this->assertSame(['Planned', 'Todo', 'Doing'], $project->ticketStatuses()->pluck('name')->all());
+        $this->assertSame(['Bug', 'Epic'], $project->ticketTypes()->pluck('name')->all());
+        $this->assertSame(['Story estimate'], $project->ticketFieldDefinitions()->pluck('label')->all());
+        $this->assertSame(['Medium'], $project->ticketPriorities()->pluck('name')->all());
+        $this->assertCount(0, $project->ticketLinkTypes);
+        $this->assertCount(0, $project->repositoryConnections);
+        $this->assertCount(0, $project->notificationActions);
+
+        $duplicatedTodoStatus = $project->ticketStatuses()->where('name', 'Todo')->firstOrFail();
+        $this->assertSame(['Doing'], $duplicatedTodoStatus->allowedTargetStatuses()->pluck('name')->all());
+    }
+
+    public function test_project_duplication_requires_accessible_source_projects(): void
+    {
+        $user = User::factory()->create();
+        $this->syncGlobalPermissions($user, ['project:create']);
+        $sourceProject = Project::factory()->create();
+
+        $this->actingAs($user)
+            ->from(route('projects.create'))
+            ->post(route('projects.store'), [
+                'name' => 'Denied Duplicate',
+                'key' => 'deny',
+                'creation_mode' => 'duplicate',
+                'source_project_id' => $sourceProject->id,
+            ])
+            ->assertSessionHasErrors('source_project_id')
+            ->assertRedirect(route('projects.create'));
+    }
+
     /**
      * Ensure project keys cannot exceed five characters.
      */
@@ -332,6 +597,159 @@ class ProjectControllerTest extends TestCase
             );
     }
 
+    public function test_project_admins_can_switch_projects_to_another_template(): void
+    {
+        $user = User::factory()->create();
+        $project = Project::factory()->create([
+            'key' => 'CORE',
+            'name' => 'Core Platform',
+            'show_author' => false,
+            'show_story_points' => false,
+        ]);
+        $currentTemplate = ProjectTemplate::factory()->create([
+            'name' => 'Current Template',
+            'slug' => 'current-template',
+            'copy_areas' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+            ],
+            'configuration_snapshot' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS => [
+                    'show_author' => false,
+                    'show_story_points' => false,
+                ],
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES => [
+                    ['name' => 'Bug', 'position' => 1, 'is_parent' => false],
+                ],
+            ],
+        ]);
+        $newTemplate = ProjectTemplate::factory()->create([
+            'name' => 'Operations Template',
+            'slug' => 'operations-template',
+            'copy_areas' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+            ],
+            'configuration_snapshot' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS => [
+                    'show_author' => true,
+                    'show_story_points' => true,
+                ],
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES => [
+                    ['name' => 'Incident', 'position' => 1, 'is_parent' => false],
+                    ['name' => 'Maintenance', 'position' => 2, 'is_parent' => false],
+                ],
+            ],
+        ]);
+
+        $project->update(['project_template_id' => $currentTemplate->id]);
+        $project->ticketTypes()->delete();
+        TicketType::factory()->create(['project_id' => $project->id, 'name' => 'Bug', 'position' => 1, 'is_parent' => false]);
+
+        $this->syncProjectPermissions($project, $user, ['admin']);
+
+        $this->actingAs($user)
+            ->from(route('projects.settings.general', $project))
+            ->post(route('projects.settings.general.switch-template', $project), [
+                'confirmation_key' => 'CORE',
+                'source_template_id' => $newTemplate->id,
+            ])
+            ->assertRedirect(route('projects.settings.general', $project))
+            ->assertSessionHas('status', 'Core Platform now uses the Operations Template template.');
+
+        $project->refresh();
+
+        $this->assertSame($newTemplate->id, $project->project_template_id);
+        $this->assertTrue($project->show_author);
+        $this->assertTrue($project->show_story_points);
+        $this->assertSame(['Incident', 'Maintenance'], $project->ticketTypes()->pluck('name')->all());
+        $this->assertDatabaseHas('ticket_types', [
+            'project_id' => $project->id,
+            'project_template_id' => $newTemplate->id,
+            'name' => 'Incident',
+        ]);
+    }
+
+    public function test_project_admins_can_reset_projects_to_their_current_template_baseline(): void
+    {
+        $user = User::factory()->create();
+        $project = Project::factory()->create([
+            'key' => 'CORE',
+            'name' => 'Core Platform',
+            'show_author' => false,
+            'show_story_points' => false,
+        ]);
+        $template = ProjectTemplate::factory()->create([
+            'name' => 'Workflow Template',
+            'slug' => 'workflow-template',
+            'copy_areas' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+            ],
+            'configuration_snapshot' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS => [
+                    'show_author' => true,
+                    'show_story_points' => true,
+                ],
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES => [
+                    ['name' => 'Bug', 'position' => 1, 'is_parent' => false],
+                    ['name' => 'Feature', 'position' => 2, 'is_parent' => false],
+                ],
+            ],
+        ]);
+
+        $project->update(['project_template_id' => $template->id]);
+        $project->ticketTypes()->delete();
+        TicketType::factory()->create(['project_id' => $project->id, 'name' => 'Custom', 'position' => 1, 'is_parent' => false]);
+
+        $this->syncProjectPermissions($project, $user, ['admin']);
+
+        $this->actingAs($user)
+            ->from(route('projects.settings.general', $project))
+            ->post(route('projects.settings.general.reset-template', $project), [
+                'confirmation_key' => 'CORE',
+            ])
+            ->assertRedirect(route('projects.settings.general', $project))
+            ->assertSessionHas('status', 'Core Platform was reset to the Workflow Template template baseline.');
+
+        $project->refresh();
+
+        $this->assertSame($template->id, $project->project_template_id);
+        $this->assertTrue($project->show_author);
+        $this->assertTrue($project->show_story_points);
+        $this->assertSame(['Bug', 'Feature'], $project->ticketTypes()->pluck('name')->all());
+        $this->assertDatabaseHas('ticket_types', [
+            'project_id' => $project->id,
+            'project_template_id' => $template->id,
+            'name' => 'Bug',
+        ]);
+    }
+
+    public function test_project_template_switch_requires_exact_project_key_confirmation(): void
+    {
+        $user = User::factory()->create();
+        $project = Project::factory()->create([
+            'key' => 'CORE',
+        ]);
+        $project->update([
+            'project_template_id' => ProjectTemplate::factory()->create()->id,
+        ]);
+        $newTemplate = ProjectTemplate::factory()->create();
+
+        $this->syncProjectPermissions($project, $user, ['admin']);
+
+        $this->actingAs($user)
+            ->from(route('projects.settings.general', $project))
+            ->post(route('projects.settings.general.switch-template', $project), [
+                'confirmation_key' => 'core',
+                'source_template_id' => $newTemplate->id,
+            ])
+            ->assertRedirect(route('projects.settings.general', $project))
+            ->assertSessionHasErrors('confirmation_key');
+
+        $this->assertNotSame($newTemplate->id, $project->fresh()->project_template_id);
+    }
+
     /**
      * Ensure admins can delete projects and their dependent project-scoped data.
      */

tests/Feature/Projects/ProjectNotificationSettingsControllerTest.php

@@ -2,10 +2,12 @@
 
 namespace Tests\Feature\Projects;
 
+use App\Actions\Projects\DuplicateProjectConfiguration;
 use App\Enums\NotificationChannel;
 use App\Enums\NotificationEventType;
 use App\Models\NotificationAction;
 use App\Models\Project;
+use App\Models\ProjectTemplate;
 use App\Models\User;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Inertia\Testing\AssertableInertia as Assert;
@@ -41,6 +43,15 @@ class ProjectNotificationSettingsControllerTest extends TestCase
                 ],
             ]);
 
+        $template = ProjectTemplate::factory()->create([
+            'configuration_snapshot' => app(DuplicateProjectConfiguration::class)->export($project, [
+                DuplicateProjectConfiguration::COPY_NOTIFICATION_ACTIONS,
+            ]),
+            'copy_areas' => [DuplicateProjectConfiguration::COPY_NOTIFICATION_ACTIONS],
+            'name' => 'Alert Template',
+        ]);
+        $project->update(['project_template_id' => $template->id]);
+
         $this->syncProjectPermissions($project, $user, ['edit']);
 
         $this->actingAs($user)
@@ -72,6 +83,8 @@ class ProjectNotificationSettingsControllerTest extends TestCase
                 ->where('templateVariables.6.value', '$actor_name')
                 ->where('templateVariables.7.value', '$assignee_from')
                 ->where('templateVariables.8.value', '$assignee_to')
+                ->where('templateState.templateName', 'Alert Template')
+                ->where('templateState.inheritedAreas.0.value', DuplicateProjectConfiguration::COPY_NOTIFICATION_ACTIONS)
                 ->missing('notificationActions.0.delivery_url'),
             );
     }

tests/Feature/Projects/ProjectRepositorySettingsControllerTest.php

@@ -3,7 +3,9 @@
 namespace Tests\Feature\Projects;
 
 use App\Actions\Git\GitProviderKey;
+use App\Actions\Projects\DuplicateProjectConfiguration;
 use App\Models\Project;
+use App\Models\ProjectTemplate;
 use App\Models\RepositoryConnection;
 use App\Models\User;
 use App\Models\UserGitConnection;
@@ -36,6 +38,15 @@ class ProjectRepositorySettingsControllerTest extends TestCase
             'repository_url' => 'https://git.example.test/core-team/kanbangit',
         ]);
 
+        $template = ProjectTemplate::factory()->create([
+            'configuration_snapshot' => app(DuplicateProjectConfiguration::class)->export($project, [
+                DuplicateProjectConfiguration::COPY_REPOSITORY_CONNECTIONS,
+            ]),
+            'copy_areas' => [DuplicateProjectConfiguration::COPY_REPOSITORY_CONNECTIONS],
+            'name' => 'Connected Template',
+        ]);
+        $project->update(['project_template_id' => $template->id]);
+
         $this->syncProjectPermissions($project, $user, ['edit']);
 
         $this->actingAs($user)
@@ -46,7 +57,9 @@ class ProjectRepositorySettingsControllerTest extends TestCase
                 ->where('project.id', $project->id)
                 ->where('repositoryConnections.0.repository_full_name', 'core-team/kanbangit')
                 ->where('repositoryConnections.0.has_personal_access', false)
-                ->where('availableRepositorySources', []),
+                ->where('availableRepositorySources', [])
+                ->where('templateState.templateName', 'Connected Template')
+                ->where('templateState.inheritedAreas.0.value', DuplicateProjectConfiguration::COPY_REPOSITORY_CONNECTIONS),
             );
     }
 

tests/Feature/Projects/ProjectTemplateControllerTest.php

@@ -0,0 +1,306 @@
+<?php
+
+namespace Tests\Feature\Projects;
+
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Models\BoardColumn;
+use App\Models\Project;
+use App\Models\ProjectTemplate;
+use App\Models\TicketStatus;
+use App\Models\TicketType;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Inertia\Testing\AssertableInertia as Assert;
+use Tests\TestCase;
+
+class ProjectTemplateControllerTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_users_with_project_create_permission_can_view_templates_index_and_create_screen(): void
+    {
+        $user = User::factory()->create();
+        $project = Project::factory()->create([
+            'name' => 'Core Platform',
+            'key' => 'CORE',
+        ]);
+        $template = ProjectTemplate::factory()->create([
+            'name' => 'Foundation Template',
+            'slug' => 'foundation-template',
+            'source_project_id' => $project->id,
+        ]);
+        ProjectTemplate::factory()->create([
+            'name' => 'Hidden Base Template',
+            'slug' => 'hidden-base-template',
+            'project_id' => $project->id,
+            'source_project_id' => $project->id,
+            'is_published' => false,
+        ]);
+
+        $this->syncGlobalPermissions($user, ['project:create']);
+        $this->syncProjectPermissions($project, $user, ['view']);
+
+        $this->actingAs($user)
+            ->get('/project-templates')
+            ->assertOk()
+            ->assertInertia(fn (Assert $page) => $page
+                ->component('project-templates/Index')
+                ->has('templates', 1)
+                ->where('templates.0.id', $template->id)
+                ->where('templates.0.slug', 'foundation-template')
+                ->where('templates.0.is_published', true));
+
+        $this->actingAs($user)
+            ->get(route('projects.templates.create', $project))
+            ->assertOk()
+            ->assertInertia(fn (Assert $page) => $page
+                ->component('project-templates/Create')
+                ->where('project.id', $project->id)
+                ->has('copyAreaOptions', count(DuplicateProjectConfiguration::copyableAreas())));
+
+        $this->actingAs($user)
+            ->get(route('project-templates.edit', $template))
+            ->assertOk()
+            ->assertInertia(fn (Assert $page) => $page
+                ->component('project-templates/Edit')
+                ->where('template.id', $template->id)
+                ->where('template.slug', 'foundation-template')
+                ->has('copyAreaOptions', count(DuplicateProjectConfiguration::copyableAreas())));
+    }
+
+    public function test_users_can_save_and_delete_templates_from_projects(): void
+    {
+        $user = User::factory()->create();
+        $project = Project::factory()->create([
+            'name' => 'Source Project',
+            'key' => 'SRC1',
+            'show_author' => false,
+            'show_story_points' => false,
+        ]);
+
+        $this->syncGlobalPermissions($user, ['project:create']);
+        $this->syncProjectPermissions($project, $user, ['view']);
+
+        $project->ticketTypes()->delete();
+        $project->ticketStatuses()->delete();
+        $project->boardColumns()->delete();
+
+        $boardColumn = BoardColumn::factory()->create([
+            'project_id' => $project->id,
+            'name' => 'Doing',
+            'position' => 1,
+        ]);
+        $ticketStatus = TicketStatus::factory()->create([
+            'project_id' => $project->id,
+            'board_column_id' => $boardColumn->id,
+            'name' => 'Doing',
+            'position' => 1,
+        ]);
+        $ticketStatus->allowedTargetStatuses()->sync([$ticketStatus->id]);
+        TicketType::factory()->create([
+            'project_id' => $project->id,
+            'name' => 'Bug',
+            'position' => 1,
+        ]);
+
+        $this->actingAs($user)
+            ->post(route('projects.templates.store', $project), [
+                'name' => 'Core Reusable',
+                'slug' => 'core-reusable',
+                'copy_areas' => [
+                    DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                    DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+                ],
+            ])
+            ->assertRedirect('/project-templates');
+
+        $template = ProjectTemplate::query()->where('slug', 'core-reusable')->firstOrFail();
+
+        $this->assertTrue($template->is_published);
+        $this->assertNull($template->project_id);
+
+        $this->assertSame([
+            DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS => [
+                'show_author' => false,
+                'show_story_points' => false,
+            ],
+            DuplicateProjectConfiguration::COPY_TICKET_TYPES => [
+                [
+                    'name' => 'Bug',
+                    'position' => 1,
+                    'is_parent' => false,
+                ],
+            ],
+        ], $template->configuration_snapshot);
+
+        $this->actingAs($user)
+            ->delete(route('project-templates.destroy', $template))
+            ->assertRedirect('/project-templates');
+
+        $this->assertDatabaseMissing('project_templates', [
+            'id' => $template->id,
+        ]);
+    }
+
+    public function test_hidden_base_templates_cannot_be_deleted_from_the_management_flow(): void
+    {
+        $user = User::factory()->create();
+        $project = Project::factory()->create();
+        $template = ProjectTemplate::factory()->create([
+            'project_id' => $project->id,
+            'source_project_id' => $project->id,
+            'is_published' => false,
+        ]);
+
+        $this->syncGlobalPermissions($user, ['project:create']);
+
+        $this->actingAs($user)
+            ->delete(route('project-templates.destroy', $template))
+            ->assertNotFound();
+
+        $this->actingAs($user)
+            ->get(route('project-templates.edit', $template))
+            ->assertNotFound();
+    }
+
+    public function test_updating_a_template_requires_warning_acknowledgement_when_projects_are_linked(): void
+    {
+        $user = User::factory()->create();
+        $sourceProject = Project::factory()->create();
+        $template = ProjectTemplate::factory()->create([
+            'source_project_id' => $sourceProject->id,
+        ]);
+        Project::factory()->create([
+            'project_template_id' => $template->id,
+        ]);
+
+        $this->syncGlobalPermissions($user, ['project:create']);
+
+        $this->actingAs($user)
+            ->patch(route('project-templates.update', $template), [
+                'name' => 'Updated Template',
+                'copy_areas' => [DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS],
+            ])
+            ->assertSessionHasErrors('confirm_linked_projects_update');
+    }
+
+    public function test_updating_a_template_refreshes_the_baseline_and_preserves_slug_and_overrides(): void
+    {
+        $user = User::factory()->create();
+        $sourceProject = Project::factory()->create([
+            'name' => 'Template Source',
+            'show_author' => false,
+            'show_story_points' => false,
+        ]);
+        TicketType::factory()->create([
+            'project_id' => $sourceProject->id,
+            'name' => 'Feature',
+            'position' => 1,
+            'is_parent' => false,
+        ]);
+
+        $template = ProjectTemplate::factory()->create([
+            'name' => 'Platform Template',
+            'slug' => 'platform-template',
+            'copy_areas' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+            ],
+            'configuration_snapshot' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS => [
+                    'show_author' => false,
+                    'show_story_points' => false,
+                ],
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES => [
+                    [
+                        'name' => 'Bug',
+                        'position' => 1,
+                        'is_parent' => false,
+                    ],
+                ],
+            ],
+            'source_project_id' => $sourceProject->id,
+        ]);
+        $inheritingProject = Project::factory()->create([
+            'project_template_id' => $template->id,
+            'show_author' => false,
+            'show_story_points' => false,
+        ]);
+        $overriddenProject = Project::factory()->create([
+            'project_template_id' => $template->id,
+            'show_author' => true,
+            'show_story_points' => false,
+        ]);
+        TicketType::factory()->create([
+            'project_id' => $inheritingProject->id,
+            'name' => 'Bug',
+            'position' => 1,
+            'is_parent' => false,
+        ]);
+        TicketType::factory()->create([
+            'project_id' => $overriddenProject->id,
+            'name' => 'Custom',
+            'position' => 1,
+            'is_parent' => false,
+        ]);
+        $inheritingProject->refresh()->forceFill(['template_overrides' => []])->saveQuietly();
+        $overriddenProject->refresh()->forceFill([
+            'template_overrides' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+            ],
+        ])->saveQuietly();
+
+        $sourceProject->forceFill([
+            'show_author' => true,
+            'show_story_points' => true,
+        ])->save();
+
+        $this->syncGlobalPermissions($user, ['project:create']);
+
+        $this->actingAs($user)
+            ->patch(route('project-templates.update', $template), [
+                'name' => 'Platform Template v2',
+                'slug' => 'should-not-change',
+                'copy_areas' => [
+                    DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                    DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+                ],
+                'confirm_linked_projects_update' => true,
+            ])
+            ->assertRedirect('/project-templates');
+
+        $template->refresh();
+        $inheritingProject->refresh();
+        $overriddenProject->refresh();
+
+        $this->assertSame('Platform Template v2', $template->name);
+        $this->assertSame('platform-template', $template->slug);
+        $this->assertSame([
+            DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS => [
+                'show_author' => true,
+                'show_story_points' => true,
+            ],
+            DuplicateProjectConfiguration::COPY_TICKET_TYPES => [
+                [
+                    'name' => 'Feature',
+                    'position' => 1,
+                    'is_parent' => false,
+                ],
+            ],
+        ], $template->configuration_snapshot);
+
+        $this->assertTrue($inheritingProject->show_author);
+        $this->assertTrue($inheritingProject->show_story_points);
+        $this->assertSame(['Feature'], $inheritingProject->ticketTypes()->pluck('name')->all());
+        $this->assertDatabaseHas('ticket_types', [
+            'project_id' => $inheritingProject->id,
+            'project_template_id' => $template->id,
+            'name' => 'Feature',
+        ]);
+
+        $this->assertTrue($overriddenProject->show_author);
+        $this->assertFalse($overriddenProject->show_story_points);
+        $this->assertSame(['Custom'], $overriddenProject->ticketTypes()->pluck('name')->all());
+    }
+}

tests/Feature/Projects/ProjectTemplateOverrideTest.php

@@ -0,0 +1,263 @@
+<?php
+
+namespace Tests\Feature\Projects;
+
+use App\Actions\Projects\CreateProject;
+use App\Actions\Projects\DuplicateProjectConfiguration;
+use App\Actions\Projects\UpdateProjectTemplate;
+use App\Actions\Projects\UpdateProjectTemplateLink;
+use App\Models\BoardColumn;
+use App\Models\Project;
+use App\Models\ProjectTemplate;
+use App\Models\Ticket;
+use App\Models\TicketFieldDefinition;
+use App\Models\TicketFieldValue;
+use App\Models\TicketPriority;
+use App\Models\TicketStatus;
+use App\Models\TicketType;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class ProjectTemplateOverrideTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_template_updates_preserve_status_ids_and_existing_tickets(): void
+    {
+        $sourceProject = Project::factory()->create();
+        $sourceStatus = TicketStatus::factory()->for($sourceProject)->create(['name' => 'Todo', 'position' => 1]);
+        $template = $this->createTemplate($sourceProject, [DuplicateProjectConfiguration::COPY_TICKET_STATUSES]);
+        $project = Project::factory()->create();
+        $status = TicketStatus::factory()->for($project)->create(['name' => 'Todo', 'position' => 1]);
+        $project->forceFill(['project_template_id' => $template->id])->saveQuietly();
+        $ticket = $this->createTicket($project, $status);
+
+        $sourceStatus->update(['name' => 'Ready']);
+        app(UpdateProjectTemplate::class)->handle($template, [
+            'name' => $template->name,
+            'copy_areas' => [DuplicateProjectConfiguration::COPY_TICKET_STATUSES],
+        ]);
+
+        $this->assertSame('Ready', $status->fresh()->name);
+        $this->assertSame($status->id, $ticket->fresh()->ticket_status_id);
+        $this->assertDatabaseHas('tickets', ['id' => $ticket->id]);
+    }
+
+    public function test_projects_created_from_a_template_start_with_inherited_areas(): void
+    {
+        $sourceProject = Project::factory()->create();
+        $sourceStatus = TicketStatus::factory()->for($sourceProject)->create(['name' => 'Todo', 'position' => 1]);
+        $template = $this->createTemplate($sourceProject, [DuplicateProjectConfiguration::COPY_TICKET_STATUSES]);
+
+        $project = app(CreateProject::class)->handle([
+            'name' => 'Inherited project',
+            'key' => 'INHR',
+            'creation_mode' => 'template',
+            'source_template_id' => $template->id,
+        ], User::factory()->create());
+
+        $this->assertSame([], $project->template_overrides);
+
+        $sourceStatus->update(['name' => 'Ready']);
+        app(UpdateProjectTemplate::class)->handle($template, [
+            'name' => $template->name,
+            'copy_areas' => [DuplicateProjectConfiguration::COPY_TICKET_STATUSES],
+        ]);
+
+        $this->assertSame(['Ready'], $project->ticketStatuses()->pluck('name')->all());
+    }
+
+    public function test_local_override_remains_detached_even_when_it_temporarily_matches_the_template(): void
+    {
+        $sourceProject = Project::factory()->create();
+        $sourceStatus = TicketStatus::factory()->for($sourceProject)->create(['name' => 'Todo', 'position' => 1]);
+        $template = $this->createTemplate($sourceProject, [DuplicateProjectConfiguration::COPY_TICKET_STATUSES]);
+        $project = Project::factory()->create();
+        $status = TicketStatus::factory()->for($project)->create(['name' => 'Todo', 'position' => 1]);
+        $project->forceFill(['project_template_id' => $template->id])->saveQuietly();
+
+        $status->update(['name' => 'Project only']);
+        $status->update(['name' => 'Todo']);
+        $this->assertContains(
+            DuplicateProjectConfiguration::COPY_TICKET_STATUSES,
+            $project->fresh()->template_overrides,
+        );
+        $sourceStatus->update(['name' => 'Ready']);
+        app(UpdateProjectTemplate::class)->handle($template, [
+            'name' => $template->name,
+            'copy_areas' => [DuplicateProjectConfiguration::COPY_TICKET_STATUSES],
+        ]);
+
+        $this->assertSame('Todo', $status->fresh()->name);
+        $this->assertContains(
+            DuplicateProjectConfiguration::COPY_TICKET_STATUSES,
+            $project->fresh()->template_overrides,
+        );
+    }
+
+    public function test_reset_requires_and_applies_a_replacement_for_used_local_statuses(): void
+    {
+        $user = User::factory()->create();
+        $sourceProject = Project::factory()->create();
+        TicketStatus::factory()->for($sourceProject)->create(['name' => 'Template status', 'position' => 1]);
+        $template = $this->createTemplate($sourceProject, [DuplicateProjectConfiguration::COPY_TICKET_STATUSES]);
+        $project = Project::factory()->create([
+            'project_template_id' => $template->id,
+            'template_overrides' => [DuplicateProjectConfiguration::COPY_TICKET_STATUSES],
+        ]);
+        $replacementStatus = TicketStatus::factory()->for($project)->create(['name' => 'Old template status', 'position' => 1]);
+        $localStatus = TicketStatus::factory()->for($project)->create(['name' => 'Local status', 'position' => 2]);
+        $ticket = $this->createTicket($project, $localStatus);
+        $this->syncProjectPermissions($project, $user, ['admin']);
+
+        $url = route('projects.settings.general.reset-template', $project);
+        $this->actingAs($user)->from($url)->post($url, [
+            'areas' => [DuplicateProjectConfiguration::COPY_TICKET_STATUSES],
+        ])->assertSessionHasErrors("status_replacements.{$localStatus->id}");
+
+        $this->actingAs($user)->from($url)->post($url, [
+            'areas' => [DuplicateProjectConfiguration::COPY_TICKET_STATUSES],
+            'status_replacements' => [$localStatus->id => $replacementStatus->id],
+        ])->assertSessionHasNoErrors();
+
+        $this->assertDatabaseMissing('ticket_statuses', ['id' => $localStatus->id]);
+        $this->assertSame($replacementStatus->id, $ticket->fresh()->ticket_status_id);
+        $this->assertNotContains(
+            DuplicateProjectConfiguration::COPY_TICKET_STATUSES,
+            $project->fresh()->template_overrides,
+        );
+    }
+
+    public function test_reset_clears_only_the_selected_override_area(): void
+    {
+        $sourceProject = Project::factory()->create(['show_author' => true, 'show_story_points' => true]);
+        TicketType::factory()->for($sourceProject)->create(['name' => 'Template type', 'position' => 1]);
+        $template = $this->createTemplate($sourceProject, [
+            DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+            DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+        ]);
+        $project = Project::factory()->create([
+            'project_template_id' => $template->id,
+            'show_author' => false,
+            'show_story_points' => false,
+            'template_overrides' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+            ],
+        ]);
+        TicketType::factory()->for($project)->create(['name' => 'Local type', 'position' => 1]);
+
+        app(UpdateProjectTemplateLink::class)->reset(
+            $project->load('projectTemplate'),
+            [DuplicateProjectConfiguration::COPY_TICKET_TYPES],
+        );
+
+        $this->assertFalse($project->fresh()->show_author);
+        $this->assertSame(['Template type'], $project->ticketTypes()->pluck('name')->all());
+        $this->assertSame(
+            [DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS],
+            $project->fresh()->template_overrides,
+        );
+    }
+
+    public function test_new_template_areas_do_not_replace_existing_local_configuration(): void
+    {
+        $sourceProject = Project::factory()->create();
+        TicketType::factory()->for($sourceProject)->create(['name' => 'Template type', 'position' => 1]);
+        $template = $this->createTemplate($sourceProject, [
+            DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+        ]);
+        $project = Project::factory()->create();
+        TicketType::factory()->for($project)->create(['name' => 'Local type', 'position' => 1]);
+        $project->forceFill(['project_template_id' => $template->id])->saveQuietly();
+
+        app(UpdateProjectTemplate::class)->handle($template, [
+            'name' => $template->name,
+            'copy_areas' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+            ],
+        ]);
+
+        $this->assertSame(['Local type'], $project->ticketTypes()->pluck('name')->all());
+        $this->assertContains(
+            DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+            $project->fresh()->template_overrides,
+        );
+    }
+
+    public function test_template_updates_preserve_custom_field_values(): void
+    {
+        $sourceProject = Project::factory()->create();
+        $sourceField = TicketFieldDefinition::factory()->for($sourceProject)->create([
+            'field_type' => 'number', 'label' => 'Estimate', 'position' => 1,
+        ]);
+        $template = $this->createTemplate($sourceProject, [DuplicateProjectConfiguration::COPY_TICKET_FIELDS]);
+        $project = Project::factory()->create();
+        $field = TicketFieldDefinition::factory()->for($project)->create([
+            'field_type' => 'number', 'label' => 'Estimate', 'position' => 1,
+        ]);
+        $project->forceFill(['project_template_id' => $template->id])->saveQuietly();
+        $status = TicketStatus::factory()->for($project)->create();
+        $ticket = $this->createTicket($project, $status);
+        $fieldValue = TicketFieldValue::factory()->create([
+            'ticket_id' => $ticket->id,
+            'ticket_field_definition_id' => $field->id,
+            'value_number' => 8,
+        ]);
+
+        $sourceField->update(['label' => 'Story points']);
+        app(UpdateProjectTemplate::class)->handle($template, [
+            'name' => $template->name,
+            'copy_areas' => [DuplicateProjectConfiguration::COPY_TICKET_FIELDS],
+        ]);
+
+        $this->assertSame('Story points', $field->fresh()->label);
+        $this->assertSame($field->id, $fieldValue->fresh()->ticket_field_definition_id);
+        $this->assertEquals(8, $fieldValue->fresh()->value_number);
+    }
+
+    public function test_removing_a_board_column_never_deletes_its_statuses_or_tickets(): void
+    {
+        $project = Project::factory()->create();
+        $column = BoardColumn::factory()->for($project)->create();
+        $status = TicketStatus::factory()->for($project)->create([
+            'board_column_id' => $column->id,
+        ]);
+        $ticket = $this->createTicket($project, $status);
+
+        $blockedAreas = app(DuplicateProjectConfiguration::class)->apply($project, [
+            DuplicateProjectConfiguration::COPY_BOARD_COLUMNS => [],
+        ]);
+
+        $this->assertSame([DuplicateProjectConfiguration::COPY_BOARD_COLUMNS], $blockedAreas);
+        $this->assertDatabaseHas('board_columns', ['id' => $column->id]);
+        $this->assertDatabaseHas('ticket_statuses', ['id' => $status->id]);
+        $this->assertSame($status->id, $ticket->fresh()->ticket_status_id);
+    }
+
+    /** @param list<string> $areas */
+    private function createTemplate(Project $sourceProject, array $areas): ProjectTemplate
+    {
+        return ProjectTemplate::factory()->create([
+            'source_project_id' => $sourceProject->id,
+            'copy_areas' => $areas,
+            'configuration_snapshot' => app(DuplicateProjectConfiguration::class)->export($sourceProject, $areas),
+        ]);
+    }
+
+    private function createTicket(Project $project, TicketStatus $status): Ticket
+    {
+        $type = TicketType::factory()->for($project)->create();
+        $priority = TicketPriority::factory()->for($project)->create();
+
+        return Ticket::factory()->create([
+            'project_id' => $project->id,
+            'ticket_status_id' => $status->id,
+            'ticket_type_id' => $type->id,
+            'ticket_priority_id' => $priority->id,
+            'ticket_key' => $project->key.'-1',
+        ]);
+    }
+}

tests/Feature/Projects/ProjectTicketMetadataSettingsControllerTest.php

@@ -2,8 +2,10 @@
 
 namespace Tests\Feature\Projects;
 
+use App\Actions\Projects\DuplicateProjectConfiguration;
 use App\Actions\ProjectTicketMetadata\InitializeProjectTicketMetadata;
 use App\Models\Project;
+use App\Models\ProjectTemplate;
 use App\Models\Ticket;
 use App\Models\TicketFieldDefinition;
 use App\Models\TicketLinkType;
@@ -37,6 +39,25 @@ class ProjectTicketMetadataSettingsControllerTest extends TestCase
             'position' => 1,
         ]);
 
+        $template = ProjectTemplate::factory()->create([
+            'configuration_snapshot' => app(DuplicateProjectConfiguration::class)->export($project, [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+                DuplicateProjectConfiguration::COPY_TICKET_LINK_TYPES,
+            ]),
+            'copy_areas' => [
+                DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS,
+                DuplicateProjectConfiguration::COPY_TICKET_TYPES,
+                DuplicateProjectConfiguration::COPY_TICKET_LINK_TYPES,
+            ],
+            'name' => 'Issue Tracker Template',
+        ]);
+        $project->update([
+            'project_template_id' => $template->id,
+            'show_story_points' => false,
+            'template_overrides' => [DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS],
+        ]);
+
         $this->syncProjectPermissions($project, $user, ['edit']);
 
         $this->actingAs($user)
@@ -45,12 +66,14 @@ class ProjectTicketMetadataSettingsControllerTest extends TestCase
             ->assertInertia(fn (Assert $page) => $page
                 ->component('projects/settings/Metadata')
                 ->where('project.show_author', true)
-                ->where('project.show_story_points', true)
+                ->where('project.show_story_points', false)
                 ->where('ticketTypes.0.name', 'Task')
                 ->where('ticketTypes.1.name', 'Release')
                 ->where('ticketTypes.1.is_parent', true)
                 ->where('ticketTypes.2.name', 'Bug')
-                ->where('ticketLinkTypes.0.label', 'Relates to'),
+                ->where('ticketLinkTypes.0.label', 'Relates to')
+                ->where('templateState.templateName', 'Issue Tracker Template')
+                ->where('templateState.overriddenAreas.0.value', DuplicateProjectConfiguration::COPY_PROJECT_SETTINGS),
             );
     }