How do you void a batch payment of invoices (that have not yet been paid ) so that they all appear as unpaid again under expenese

It's nice to see you here, accounts513. 

Allow me to share some information about deleting payments in QuickBooks Online (QBO). 

In QuickBooks Online, the option to delete a batch payment of invoices isn't available. You'll have to delete the payments one by one. This is to avoid accidental removal of another transaction.

Here's how:

1. Go to Sales from the left menu.
2. Choose Invoices, and click View/Edit to open the invoice transaction.
3. Under Payment Status, click the 1 payment link and click on the Date hyperlink.
4. Click the More tab and choose Delete.
5. Click Yes to confirm.

Additionally, this guide contains resources to help efficiently manage customer transactions in QBO: Sales and customers.

Please leave a comment below if you need anything else with managing transactions in QBO. I'd be glad to help.