It's nice to see you again, @mike41.
I'd be delighted to get you moving in the right direction on how you'll handle this in QuickBooks.
Let me assume that you've already posted a payment cheque in QuickBooks with the full amount. Since you received a refund, you can make a bank deposit for that amount and enter Creditors as the affected account.
Here's how:
Once done, this will show on the open balance as credit. You can apply this to the next payment transaction for your supplier. You can check this article on how to enter an available credit to a bill: Enter and pay bills.
Please know you can reach me here anytime you need a helping hand with QuickBooks, I'm here to ensure your success. Thanks for coming to the Community, wishing you a terrific rest of your week.
You have clicked a link to a site outside of the QuickBooks or ProFile Communities. By clicking "Continue", you will leave the community and be taken to that site instead.