Hi ccf2,

I've got your back on how you can modify the account of the invoice payment. 

Let me guide you with these steps:

1. From the Sales tab, select Customers.
2. Select the customer's name.
3. On the Transaction List tab, select the invoice payment that you want to modify.
4. Select the correct account on the Deposit To field.
5. Click Save and close.
6. Select Yes.

If you want to have a visual flow of your customer-related transactions, you can run a report like Sales by Customer Detail. You can check these articles as your references:

• Run reports in QuickBooks Online
• Common custom reports in QuickBooks Online

Please don't hesitate to mention my name whenever you have questions. I'll be around.