How can I undo a bad banking data upload?

Hi, dan181.

Thanks for reaching out to us here in the Community. I'm here to help you undo bad banking data in QuickBooks Online.

For now, you'll need to manually select and delete the transactions. Here's how:

1. Go to the Banking menu.
2. Choose the For Review tab.
3. Mark the items you want to delete.
4. Hit the Batch actions button and click Exclude Selected.
5. Once done, go to the Excluded tab.
6. Mark all the items to be deleted.
7. Tap the Batch actions button and choose Delete.

In addition, I've also added this article that'll help you on how to manually upload transactions in QuickBooks Online.

Get back to me  if you have any additional questions about your bank transactions. I'm always here to help.