You can view your inventory levels by using the “Manage FBA Inventory” drop-down in Seller Central. The inventory categories are:
Another category for inventory is stranded inventory. Stranded inventory is product in a fulfillment center that does not have an active offer on Amazon. You can view the “Stranded Inventory”
report in Seller Central which details how to fix the stranded inventory. If you use a product only for MCF and don’t want to sell it on Amazon, you can set the "Sell by" date into the future. Then, there will be no active offer for that product. Although this product will be marked as stranded inventory, it has no negative impact to your IPI score as long as you use the product for MCF.