Hi Debbie Nev,
Hope you're having a great evening! I'll help you handle your posted transaction.
You can undo the posted transaction to bring it back to the For Review tab, and from there, you can split it.
- On the Banking page, click the Categorized tab.
- Click Undo on the transaction in question.
On the other hand, I think, it is better if you record transactions based on the real situation, so that you can easily reconcile them. Since the payment is combined into a single deposit in your bank, your register should also show the same thing. To achieve this, you can record a payment for each invoice and combine them into a single deposit. Then, that deposit will become a matching entry in the downloaded transaction.
If the deposited amount is less than the total payment because of a processing fee, you can also add another line in the deposit to represent the fee.

That's it. If you need more help with matching your transactions, feel free to let me know.