How do we modify an entered cheque. Was entered under petty cash and needs to be entered under the bank?

Hello lenny-the-rat,

Thanks for joining us here in the QuickBooks Online community! We're glad to have you and I can absolutely help you with editing your cheques.

One of the great things about QuickBooks Online is that you're able to make changes to your transactions to make sure they're going to and from the correct places. To change the account on a cheque, follow these steps.

1. Click Expenses from the left menu.
2. Find the cheque in question (Hint: Use the Filter option to narrow down your search).
3. Click View/Edit in the Action column.
4. Choose the correct account from Payment account.
5. Hit Save and close.

And just like that, you're done! Learn more about entering cheques here: How to write cheques

I hope that helps! Enjoy your evening. :)