New enterprise feature

shared/subscription/plans.py

@@ -92,6 +92,12 @@ class QuotaLimits:
         SubscriptionTier.ENTERPRISE: None,  # Unlimited
     }
 
+    MAX_CHILD_TENANTS = {
+        SubscriptionTier.STARTER: 0,
+        SubscriptionTier.PROFESSIONAL: 0,
+        SubscriptionTier.ENTERPRISE: 50,  # Default limit for enterprise tier
+    }
+
     # ===== ML & Analytics Quotas (Daily Limits) =====
     TRAINING_JOBS_PER_DAY = {
         SubscriptionTier.STARTER: 1,
@@ -296,6 +302,12 @@ class PlanFeatures:
         'production_distribution',  # NEW: Hero feature - Central production → multi-store distribution
         'centralized_dashboard',  # NEW: Hero feature - Single control panel for all operations
         'multi_tenant_management',
+        'parent_child_tenants',  # NEW: Enterprise tier feature - hierarchical tenant model
+        'internal_transfers',  # NEW: Internal PO transfers between parent/child
+        'distribution_management',  # NEW: Internal transfer management
+        'transfer_pricing',  # NEW: Cost-based transfer pricing
+        'centralized_demand_aggregation',  # NEW: Aggregate demand from all child tenants
+        'multi_location_dashboard',  # NEW: Dashboard spanning multiple locations
 
         # Advanced Integration
         'full_api_access',
@@ -360,6 +372,40 @@ class PlanFeatures:
             feature in PlanFeatures.ENTERPRISE_FEATURES
         )
 
+    @staticmethod
+    def validate_tenant_access(tier: str, tenant_type: str) -> bool:
+        """
+        Validate tenant type is allowed for subscription tier
+
+        Args:
+            tier: Subscription tier (starter, professional, enterprise)
+            tenant_type: Tenant type (standalone, parent, child)
+
+        Returns:
+            bool: True if tenant type is allowed for this tier
+        """
+        tier_enum = SubscriptionTier(tier.lower())
+
+        # Only enterprise can have parent/child hierarchy
+        if tenant_type in ["parent", "child"]:
+            return tier_enum == SubscriptionTier.ENTERPRISE
+
+        # Standalone tenants allowed for all tiers
+        return tenant_type == "standalone"
+
+    @staticmethod
+    def validate_internal_transfers(tier: str) -> bool:
+        """
+        Check if tier can use internal transfers
+
+        Args:
+            tier: Subscription tier
+
+        Returns:
+            bool: True if tier has access to internal transfers
+        """
+        return PlanFeatures.has_feature(tier, "internal_transfers")
+
 
 # ============================================================================
 # FEATURE DISPLAY CONFIGURATION (User-Facing)