Apply credit against supplier invoice

Good day, debbiesap.

Have you already recorded the supplier credit? If not, follow these steps to record in in QuickBooks.

1. Click the Plus icon in the upper-right hand corner of QuickBooks.
2. Select Supplier Credit.
3. Enter all other details, then click Save and close.

Then, follow these steps if you want to apply it on an unpaid invoice/bill:

1. Open the bill or supplier's invoice.
2. Scroll-down to the Credits section and select the existing credit. 
3. Click Save and close.

If the transaction has already been paid, follow the same steps above on future invoices/bills.

More details about on how this process works are discussed here: How Do I Handle Supplier Credits And Refunds?. 

I'd be glad to get back here if you need more help.