If you are running an online marketplace where a vendor has multiple physical stores and wants to manage inventory for each store.
Then you need to check out Seller Store Pickup Marketplace Add-on.
On the product edit form, a vendor can simply mention the quantity for every physical store. Once an order is placed in any of the physical stores, its quantity will be updated automatically for that physical store.
Please do contact us for any further queries or requirements. You can also check our Magento 2 Extensions for additional features.