What are Add-On items?
Add-on items are items that backers can purchase in addition to the items they receive for their pledge. Add-on items generate extra revenue for your campaign and allow your backers to buy additional items.
If a backer pledged extra funds during your campaign, they can use those funds to purchase add-on items when they fill out their survey.
You can customize the backers who see certain add-on items or charge different prices for add-on items depending on the backer’s pledge level. For more information, see Change Add-on Item Availability in the Getting Started Guide and Sell add-on items at different prices.