Step 1 - Go into the PSS catalog and use the filters on the left hand nav to find products you wish to list
*Make sure to use the Webstore Status filer "unlisted"
To list a product you technically on need to list one MPN belonging to the Product Group and the entire Product Group will be listed to the store with all variations.
After you highlight the products as illustrated above you will simply click the Listing Creation button for Webstore. From here you will be taken to a pop-out to decide how to categorize the product.
Once you create the product listing in PSS you will see it populate to your store within 2 hours; often times far quicker than that.