Generally speaking, Shelf Quantities represent inventory and pricing from fulfillment sources that are outside the aftermarket distributor network. This feature grants you the ability to manage current inventory levels and pricing for products that you either have in your store or products that you carry in your Private Catalog.
You have two different options for adding Shelf Inventory in the E-Commerce Configuration
Option #1 - User Interface
This is a great option for changing inventory and pricing of one product at a time and dealing with less than 20 products. For detailed instructions, Click Here
Option #2 - Import csv File
Update inventory and pricing regularly by importing a structured csv file into the File Center. This is the way to go if you are looking to update quantities of several products on a regular basis. Recommended for anything more than 20 products. For detailed instructions, Click Here