I previewed an update to our invoice format, and the QBO fake data included an "online convenience fee" under the subtotal. How do I set this up?

The lines at the bottom in the QBO example invoice under SUBTOTAL are: discount 2%, tax 8.25%, shipping, total, online convenience fee, total of new charges, and balance due. This is much better than the manual workaround to add as a service item in the body of the items purchased. I can't find any resource on how to do this though. Assuming it's new functionality...