I accidentally imported invoices from 2019 and 2020 but was unable to import the payments. Is it possible to reverse or delete the import?

Yes, you can delete the imported invoices in QuickBooks Online, charleshfsafety.

You can delete the imported invoices through the Invoices section and batch delete them. Here's how:

1. Click Sales in the left panel and choose Invoices.
2. Select the imported invoices.
3. From the Batch actions drop-down, click Delete.
   
4. Hit Yes.
   

Once deleted, you can reimport the transactions and manually record the payments. To know more about the recording payments and depositing process, you can visit these resources:

Record invoice payments in QuickBooks Online.

Record and make Bank Deposits in QuickBooks Online.

If I can be of help while working in QuickBooks, feel free to let me know by adding a comment below. Have a wonderful day!

Hi, charleshfsafety.

Hope you're doing great. I wanted to see how everything is going about deleting imported invoices. Was it resolved? Do you need any additional help or clarification? If you do, just let me know. I'd be happy to help you at anytime.
Looking forward to your reply. Have a pleasant day ahead!