diff --git a/app/Domains/Catalog/Controllers/CategoryController.php b/app/Domains/Catalog/Controllers/CategoryController.php
index e89a666..2847abf 100644
--- a/app/Domains/Catalog/Controllers/CategoryController.php
+++ b/app/Domains/Catalog/Controllers/CategoryController.php
@@ -10,6 +10,7 @@ use App\Domains\Tenant\Models\Tenant;
 use App\Http\Controllers\Controller;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Response;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 
 class CategoryController extends Controller
@@ -18,7 +19,11 @@ class CategoryController extends Controller
     {
         return CategoryResource::collection(
             Category::query()
-                ->where('tenant_code', $tenant->codigo)
+                ->where(function ($query) use ($tenant): void {
+                    $query
+                        ->where('tenant_code', $tenant->codigo)
+                        ->orWhereNull('tenant_code');
+                })
                 ->with(['parent', 'subCategories', 'tenant'])
                 ->orderByDesc('id')
                 ->paginateFromRequest()
@@ -47,6 +52,7 @@ class CategoryController extends Controller
     public function update(UpdateCategoryRequest $request, Tenant $tenant, Category $categoria): CategoryResource
     {
         $categoria = $this->resolveScopedCategory($tenant, $categoria);
+        $this->ensureCategoryIsMutable($categoria);
         $categoria->update($request->validated());
 
         return CategoryResource::make($categoria->load(['parent', 'subCategories', 'tenant']));
@@ -55,6 +61,7 @@ class CategoryController extends Controller
     public function destroy(Tenant $tenant, Category $categoria): Response
     {
         $categoria = $this->resolveScopedCategory($tenant, $categoria);
+        $this->ensureCategoryIsMutable($categoria);
         $categoria->delete();
 
         return response()->noContent();
@@ -62,10 +69,17 @@ class CategoryController extends Controller
 
     protected function resolveScopedCategory(Tenant $tenant, Category $category): Category
     {
-        if ($category->tenant_code !== $tenant->codigo) {
+        if ($category->tenant_code !== null && $category->tenant_code !== $tenant->codigo) {
             throw new NotFoundHttpException('Category not found for tenant.');
         }
 
         return $category;
     }
+
+    protected function ensureCategoryIsMutable(Category $category): void
+    {
+        if ($category->isGlobal()) {
+            throw new AccessDeniedHttpException('Global categories are read-only.');
+        }
+    }
 }
diff --git a/app/Domains/Catalog/Resources/BrandResource.php b/app/Domains/Catalog/Resources/BrandResource.php
index 4bf0a04..a76d0aa 100644
--- a/app/Domains/Catalog/Resources/BrandResource.php
+++ b/app/Domains/Catalog/Resources/BrandResource.php
@@ -17,7 +17,6 @@ class BrandResource extends JsonResource
     {
         return [
             'id' => $this->id,
-            'tenant_codigo' => $this->tenant_codigo,
             'nombre' => $this->nombre,
             'descripcion' => $this->descripcion,
         ];
diff --git a/app/Domains/Catalog/Resources/CategoryResource.php b/app/Domains/Catalog/Resources/CategoryResource.php
index 609b0b4..2f73aa2 100644
--- a/app/Domains/Catalog/Resources/CategoryResource.php
+++ b/app/Domains/Catalog/Resources/CategoryResource.php
@@ -2,7 +2,6 @@
 
 namespace App\Domains\Catalog\Resources;
 
-use App\Domains\Tenant\Resources\TenantResource;
 use Illuminate\Http\Request;
 use Illuminate\Http\Resources\Json\JsonResource;
 
@@ -18,15 +17,28 @@ class CategoryResource extends JsonResource
     {
         return [
             'id' => $this->id,
-            'tenant_code' => $this->tenant_code,
             'is_global' => $this->resource->isGlobal(),
-            'tenant' => $this->resource->isGlobal()
-                ? null
-                : TenantResource::make($this->whenLoaded('tenant')),
-            'categoria_id' => $this->categoria_id,
             'nombre' => $this->nombre,
-            'parent' => self::make($this->whenLoaded('parent')),
-            'sub_categories' => self::collection($this->whenLoaded('subCategories')),
+            'parent' => $this->whenLoaded('parent', fn () => $this->serializeRelatedCategory($this->parent)),
+            'sub_categories' => $this->whenLoaded('subCategories', fn () =>
+                $this->subCategories->map(fn ($category) => $this->serializeRelatedCategory($category))->values()
+            ),
+        ];
+    }
+
+    /**
+     * @return array<string, mixed>|null
+     */
+    protected function serializeRelatedCategory(?\App\Domains\Catalog\Models\Category $category): ?array
+    {
+        if ($category === null) {
+            return null;
+        }
+
+        return [
+            'id' => $category->id,
+            'is_global' => $category->isGlobal(),
+            'nombre' => $category->nombre,
         ];
     }
 }