By default, the quantity ecomdash shares with your storefronts is the combined total of quantities in each warehouse. If you would only like to share an inventory balance from a specific warehouse, an Override Warehouse can be set at the storefront level. This setting is visible under Settings > Storefront Setup > Storefront Details.
Generally, this option should be left blank so all of your available inventory will be visible on your storefront. However, it may be useful to set an Override Warehouse in certain scenarios. For example, if you have a brick and mortar storefront and add your a Point of Sale system to ecomdash, you will only be able to sell items from the warehouse associated with your Brick and Mortar storefront. Inventory stored in other warehouses could not be sold through the Brick and Mortar storefront, so it would be appropriate to set an Override Warehouse.