Good day, bbgtllc-accts.
To clarify, is this an early payment discount? If so, we have different ways on how you can apply this to a supplier in QuickBooks Online. You can either create an income account for the discount and add it to your bill or record a supplier credit.
To add an account, here's how:
Here's a sample screenshot for a visual guide:
Once done, add the discount as a negative amount on the bill. You'll notice the amount owing reduced by the amount of the line entered. Here's a sample screenshot to see what it looks like:
For creating a supplier credit, you can read this article: Enter a credit from a supplier
I'm always around if you have any follow-up questions about the process. Stay safe!