In SC Navigator you can add Inventory data. In the template there are two separate sheets for inventory data: Inventory and Inventory Product. You can add different attributes for inventory on both sheets, such as:
Target Violation Cost (Inventory)
Variable Inventory Holding
The results related to inventory are shown on the Warehouse Results page, where you can find an overview of the inventory usage and the costs. You can read about more about this in the section Warehouse Results.