The fields are a collection of values, which cannot be changed in this box, that give a snapshot of the inventory allocation for either a particular item, for all items in a store, or, if a multi-store, for all items among the different stores.

By right-clicking within the Inventory Summary box, you can see a summary for the selected item, for all items in the store, or, if a multi-store arrangement, for all items among the stores.

If not already present, you can add this box to your Product Properties screen via the Screen Designer.