I can help you enter a credit note in QuickBooks Online, finance.

If your supplier is also a customer at the same time, you'll need to create a new customer profile first. Then, you can issue a credit memo.

You can check out this article on how to apply a credit memo to a customer: https://quickbooks.intuit.com/community/Payments/Apply-a-credit-memo-credit-or-refund-to-a-customer/...

If this is just a supplier, you’ll want to record it as a Supplier Credit.

Here's how:

1. Click Plus Icon (+) at the top then Supplier Credit.
2. In the Choose a supplier field, select the appropriate supplier name.
3. Enter the Date, Amount, and Account (the account used here is typically the original expense account on the original bill.)
4. Select Save and close.

For more details about handling a supplier credit, you can check out this article: How do I handle supplier credits and refunds?.

Feel free to leave a comment below if you have more questions. Thanks!