The Inventory Planner module does not support Magento warehouse management, but it is capable of showing the inventory data for multiple sources of goods in the catalog of your store.
Most of the information in the Inventory, Replenishment and Overstock grids is displayed for a sum of the products available at each product source your store uses. For each source, it is possible to view individual data on the total quantity of items available and the saleable quantity. The latter is the total quantity in a warehouse minus the quantity reserved by orders that are currently not shipped.