Good day to you. Thanks for sharing your concern about matching a supplier credit to a deposit in QuickBooks Online (QBO). Let me provide some details to help you achieve this.

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There's no direct way to match a bank deposit into a supplier credit, as it will not show up as a match on the Banking page. However, you can match the supplier credit to the deposit by hitting Accounts Payable (A/P) when adding/categorizing the deposit in your bank feeds.

Suppose you already have a supplier credit note, we can proceed to hit the A/P in your deposit transaction. Simply go to the Banking page if you have the deposit sitting on the For review tab. Then, add the transaction and ensure to select Accounts Payable (A/P) from the Category section and choose the correct vendor. See the sample screenshot below:

You can also edit the deposit transaction and ensure to use the A/P account.

Finally, use Pay Bills to connect the bank deposit to the vendor credit. Even though you aren’t paying a bill, this is the right thing to do as this last step is to keep your vendor expenses accurate. Here's how:

1. Click the + New button, then select Pay bills.
2. Select the bank deposit you just created. You’ll see the amount of the vendor credit in the Credit Applied field and the Total payment should be A$0.00.
3. Tap Save and close.
4.  

Additionally, you'll want to check out this article for the detailed steps in case you need to review all your vendor transactions in QBO: How to view and edit supplier transactions in QuickBooks Online.

If there's anything else about handling supplier transactions in QBO that I can help you with, please let me know by leaving a comment. Take care, and have a great day ahead!