By default, inventory in sellable warehouse will be available for all channels. However, you can restrict inventory to a specified warehouse for any given channel. For example, SKU123 has an inventory qty. of 20 in Warehouse A, and a qty of 5 in Warehouse B. The available inventory sent to Amazon can be restricted to 20 = inventory quantity in Warehouse A, while inventory available for eBay can be restricted to 5 = inventory quantity in Warehouse B. Once this is done, the available inventory for the channel displayed on the channel page will be restricted to that warehouse. Orders from that channel will deduct from the selected warehouse and inventory feeds will be sent from that warehouse.
In the images below product B002G9UGT8 has an available quantity of 10 across all sellable warehouses. However, there are 0 available in the Ecommerce NJ warehouse. By selecting the Ecommerce NJ warehouse in the Channel Warehouse page - image 1 - and clicking the Restricting Inventory Usage checkbox, the available inventory for eBay is 0, as displayed in the red box in image 2. (If the inventory had not been restricted, the quantity in the red box would have been 2, because the fixed price quantity is 2.)
Products that are replenishable will always show the fixed quantity, because they ignore the actual available quantity.
Inventory Management >