I'm here to help you with how to handle bank transactions in QuickBooks Online (QBO),

We'll need to match your deposit in the For Review tab so that the bank and QuickBooks balance will match. This will also avoid duplicates in the bank register. Here's how:

1. Go to the Banking menu then choose the For Review tab.
2. Select the Record Transfer option, then the transfer account.
3. Click Record transfer once done.

You can also check out this article about categorizing and matching bank transactions in QuickBooks Online. 

If you can't find a match between the payment and the deposit, you'll have to receive the payment and deposit it to the correct bank. This way, you can match the transactions. QuickBooks will also look for transactions that are in the bank register when looking for a match, This means that the system will not match transactions that are not yet deposited into the bank. Here's how:

1. Go to the +New icon, then choose Received payments.
2. Choose the customer, then the invoice.
3. Complete the Payment date and method.
4. Enter the exact amount.
5. Click the Deposit to a drop-down arrow, then choose the right bank.
6. Tap Save and close.

Please, click this link for further information: Record and make bank deposits in QuickBooks Online. Once done, you can now go back to the Banking tab and match the transaction again. Just follow the steps below:

1. Go to the Banking menu.
2. In the For Review tab, locate and click the transaction to match.
3. Click the Match radio button or hit Find other records.
4. Select Match.

Here's an article you can refer to for more details about categorizing and matching online bank transactions in QuickBooks Online. 

Let me also add this great resource that you can use for future reference. This provides complete information on reconciling your account accurately: Reconcile an account in QuickBooks Online.

If you still have questions about matching bank transactions, please reply in the comment section below. I'll be around for you. Take care.