Using multiple bank accounts for receiving online payments is a great functionality, Ali15.

As of now, we don't have a specific timeframe on when this feature will added to QuickBooks (and the Payments services). I recommend sending feedback to our developers regarding this option. They'll read your request and might consider this for future improvements.

Here's how:

1. Go to the Gear menu and then select Feedback.
2. Type in your feature request in the description box.
3. Once done, click on Next.
   

In the meantime, you can update the account each time an invoice is generated. However, this process may require some time as you will need to wait for all pending transactions before making any changes. I'll show you how:

1. From the Gear icon, select Account and settings.
2. Proceed to the Payments tab. Then, click the Change link beside the current bank account. 
   
3. Click Add new bank account or choose one from the list.
4. Enter the details of the bank account you want to change to.
5. Hit Save, then Submit.

You can get back on this thread to stay informed if there are any updates regarding the availability of the option. If you have any other questions about the program's features, please don't hesitate to keep us posted.