Hello Jeff,
How did you import the invoices? Are you using a third-party application to do this?
For now, we're unable to directly undo the process once the invoices are imported successfully. We'll want to delete them one at a time.
- Open the invoice.
- Click More at the bottom of the Invoice window.
- Select Delete.
- Choose Yes to confirm the action.
Let me know if you need more assistance with this. I'll be around to further help you.