I have entered a supplier credit however when I come to pay bills I cannot locate this to offset again the amount payable?

Thank you for posting here in the Community, @am-ceramics.

I can help you sort this out in no time. Let's first make sure the bill and supplier credit transaction has the same name selected under the Supplier field (see sample screenshots below).

Once done, let's proceed with applying the credits to the open bill. Here's how:

1. Search for the open bill and click Make payment.
2. Scroll down and you should be able to see the supplier credit below Credits. 
3. Put a checkmark on it. 
4. Hit Save and close.

Additionally, I recommend the following resource which contains additional insights about supplier credits:

• Enter a credit from a supplier.
• How do I handle supplier credits and refunds?.

If you have additional questions or concerns while working in QBO, leave a comment below. I’ll be happy to help you out.