Can I delete duplicate transactions?

Yes, you can, Blueridge Capital LLC. I've got the steps you need to delete them via the Chart of Accounts.

Check out below:

1. Go to the Accounting menu and select Chart of Accounts.
2. Locate the account holding the duplicate transactions and click View register.
   
3. Click on the transaction you want to delete.
4. Choose the Delete button.
   
5. Click on Yes.
   

For more information, check this article: Void or delete transactions in QuickBooks Online.

You can also read this link about finding a transaction you want to edit or review from your register: Find, review, and edit transactions in account registers.

Further, you can reconcile the account to ensure your books are updated.

Don't hesitate to comment below if you have any other QuickBooks concerns. I'd be glad to keep helping!