Hello there, @Musicman.

If you wanted to delete a Credit Memo that you’ve created in your QuickBooks Online, you can follow the steps below.

Here’s how.

1. Open the credit memo you want to delete.
2. Click the Edit menu.
3. Select the Void Credit Memo or Delete Credit Memo option from the drop-down list.

Let me leave you this article for more information about Credit Memo in QuickBooks Online. Enter and apply credit memos and delayed credits in QuickBooks Online.

Please let me know if you have any other questions, I’ll be glad to help. Have a nice day!