diff --git a/frontend/src/services/businessService.ts b/frontend/src/services/businessService.ts
index a088850..327c433 100644
--- a/frontend/src/services/businessService.ts
+++ b/frontend/src/services/businessService.ts
@@ -2,7 +2,7 @@
 import { supabase } from '@/supabase'
 import type { Business } from '@/types'
 
-const SELECT_FIELDS = 'id, name, address, phone, image_url, social_media, category, latitude, longitude, area, description, website, supplier_name, supplier_description, schedule, whatsapp, instagram, facebook, gallery_images, updated_at, is_featured'
+const SELECT_FIELDS = 'id, name, address, phone, image_url, social_media, category, latitude, longitude, area, description, website, supplier_name, supplier_description, schedule, whatsapp, instagram, facebook, gallery_images, updated_at, is_featured, parent_business_id'
 
 export const businessService = {
     /** Helper to upload file to supabase storage */
@@ -43,12 +43,14 @@ export const businessService = {
             } else if (key === 'gallery_images' && typeof value === 'string') {
                 // Comes as JSON string from the form
                 try { payload[key] = JSON.parse(value) } catch { /* ignore */ }
-            } else if (value !== 'null' && value !== '' && key !== 'file' && key !== 'image') {
-                if (value === 'true') {
+            } else if (key !== 'file' && key !== 'image') {
+                if (value === 'null') {
+                    payload[key] = null
+                } else if (value === 'true') {
                     payload[key] = true
                 } else if (value === 'false') {
                     payload[key] = false
-                } else {
+                } else if (value !== '') {
                     payload[key] = value
                 }
             }
diff --git a/frontend/src/types/index.ts b/frontend/src/types/index.ts
index 6956ae7..1342da6 100644
--- a/frontend/src/types/index.ts
+++ b/frontend/src/types/index.ts
@@ -103,6 +103,7 @@ export interface Business {
     supplier_name?: string | null  // Name of the business/operator
     supplier_description?: string | null // Info about the business/operator
     is_featured?: boolean          // To show on Map
+    parent_business_id?: string | null // Link to parent company/business
     // Template/Mold fields
     schedule?: string | null       // "Lun-Sáb 8am-10pm"
     whatsapp?: string | null       // WhatsApp number
diff --git a/frontend/src/views/AdminBusinessEditor.vue b/frontend/src/views/AdminBusinessEditor.vue
index 08eb0e7..d30aac1 100644
--- a/frontend/src/views/AdminBusinessEditor.vue
+++ b/frontend/src/views/AdminBusinessEditor.vue
@@ -10,7 +10,8 @@ const route = useRoute();
 const authStore = useAuthStore();
 const isLoading = ref(false);
 const isEditing = ref(false);
-const showMessage = ref({ text: '', type: '' });
+const showMessage = ref({ text: '', type: '' as 'success' | 'error' | '' });
+const parentOptions = ref<any[]>([]);
 
 const selectedFile = ref<File | null>(null);
 const selectedFileName = ref('');
@@ -32,17 +33,23 @@ const businessForm = ref<Partial<Business>>({
   website: '',
   schedule: '',
   whatsapp: '',
-  instagram: '',
   facebook: '',
   supplier_name: '',
   supplier_description: '',
   is_featured: false,
+  parent_business_id: null,
   gallery_images: []
 });
 
 const previewImageUrl = ref('https://images.unsplash.com/photo-1555396273-367ea4eb4db5?q=80&w=2074&auto=format&fit=crop');
 
 onMounted(async () => {
+    try {
+        const allBiz = await businessService.getAllBusinesses();
+        const routeId = route.params.id as string;
+        parentOptions.value = allBiz.filter(b => b.id !== routeId);
+    } catch (e) {}
+
     const id = route.params.id as string;
     if (id && id !== 'new') {
         isEditing.value = true;
@@ -120,12 +127,16 @@ async function saveBusiness() {
     formData.append('schedule', businessForm.value.schedule || '');
     formData.append('whatsapp', businessForm.value.whatsapp || '');
     formData.append('instagram', businessForm.value.instagram || '');
-    formData.append('facebook', businessForm.value.facebook || '');
     formData.append('supplier_name', businessForm.value.supplier_name || '');
     formData.append('supplier_description', businessForm.value.supplier_description || '');
     formData.append('is_featured', String(businessForm.value.is_featured === true));
-
     
+    if (businessForm.value.parent_business_id) {
+        formData.append('parent_business_id', businessForm.value.parent_business_id);
+    } else {
+        formData.append('parent_business_id', 'null');
+    }
+
     if (businessForm.value.gallery_images?.length) {
       formData.append('gallery_images', JSON.stringify(businessForm.value.gallery_images));
     }
@@ -272,6 +283,17 @@ const catEmoji = computed(() => CATEGORY_EMOJI[businessForm.value.category || ''
 
           <div class="form-section-label mt-4">Detalles del Proveedor / Operador</div>
           
+          <div class="form-group" style="margin-top: 12px;">
+             <label>Empresa Matriz / Local Asociado (Opcional)</label>
+             <select v-model="businessForm.parent_business_id" class="nexus-select">
+                <option :value="null">-- Ninguna (Es un registro independiente o es una Empresa Matriz) --</option>
+                <option v-for="biz in parentOptions" :key="biz.id" :value="biz.id">
+                   {{ biz.name }} ({{ biz.category }})
+                </option>
+             </select>
+             <p style="font-size: 0.75rem; color: #94a3b8; margin-top: 4px;">Útil si estás creando una 'Actividad' que pertenece a un 'Restaurante' o 'Local' existente en SIBU.</p>
+          </div>
+
           <div class="form-group grid-row" style="margin-top: 12px;">
             <div class="input-box">
               <label>Nombre del Operador / Empresa</label>