Maximum Quantity eBay listings

Capping your eBay listings at a certain quantity is beneficial when eBay has seller limits on your account. Seller limits can effect the total amount of units you can publish. Using this setting allows users with seller limits to publish more total SKUs on eBay. 

Partner Settings 

eBay 

Edit Channel 

Edit Policies 

Scroll Down to Feeds 
Locate Max Quantity per Listing and enter your desired amount.