Enable Stock Management
Inventory management is something that a lot of marketplaces require. Enabling Stock management in the WooCommerce settings will automatically enable the stock management for vendors on their dashboard. Once stock management is enabled, vendors will have the inventory tab available on their product edit form.
You must use the Standard Product on the Default Product Form in WC Vendors > Settings > Forms – Product. The Simple and Download form options do not include the inventory tab.
Vendor Stock Notifications
Vendors can be included in the stock notification emails. To enable or disable this feature go to WooCommerce > Products > Inventory