There is a Standard Report that we can run to show the quantity remaining of each item.
  1. Click Reports
  2. Click eTapestry Standard Reports
  3. Under eStore (Cart) Reports, click Cart Items - Quantity Remaining

From this report we can navigate to different parts of our Cart.
  • Click on specific Cart to manage that cart
  • Click on specific Category to go to that category of items
  • Click on specific Item to go to that item
  • Click on the Quantity to update the quantity of that item

Only enabled items with quantity being tracked will show in the report. See Can I limit the number of items in a Cart transaction? to track the quantity of an item.