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Yes, that's possible in QuickBooks Online (QBO).
For duplicate paychecks, you can either void or delete them. I suggest you attempt to delete a paycheck first, then void it if the first option is unavailable.
If this option is unavailable, then I suggest you contact our Technical Support team for further assistance.
As for duplicate transactions in your bank register, you can exclude them to resolve duplicates. Open this article for the steps: Exclude a bank transaction from your expenses in QuickBooks Online.
I'll share this related article with you as well: Void or cancel contractor payments. It has the steps on how you can manage contractor payments you have in QBO.
I'll be around in case you have other concerns. Post them below, and I'll take care of it.