Hey there, @amelia128,

It looks like there are a mix of topics in this discussion. May I know which exact process on this thread would you want to get further guidance with?

If you're referring to the main topic about creating a vendor refund and applying it to a bill, here are the steps to do it in QuickBooks Pro Desktop 2019:

1. Go to the Vendors menu and choose Enter Bill.
2. At the top of the bill, click the Credit radio button.
   
3. Once the refund detail is complete, click Save & Close.
4. When you want to apply the credit as a payment to a bill, go to the Pay Bills menu.
5. Mark the bill you want to pay then select Set Credits.
6. On the next window, mark the credit you created from the Credits tab.
   
7. Hit Done and then Pay Selected Bills.

Use this article for further guidance: Record a vendor refund in QuickBooks Desktop

If you're referring to a different topic, let me know in the comment below. I'll be right here to help you further. Have a good one!