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Thank you for visiting the QuickBooks Community. I'd be glad to assist you with being able to exclude an accepted transactions.
To do that, you need to undo the accepted transactions and exclude them.
I've added some screenshots and articles for your reference.
How to add and match downloaded banking transactions
How to add or edit transactions in a register (or account history)
Get help with QuickBooks Online
That should do it. Feel free to add a comment below if you have any other questions about excluding accepted transactions in QuickBooks Online.