Hello, @richard50.
Since you've already categorized those transactions in QBO, we can manually Undo them from the Categorized tab. I'll show you how:
- Go to Banking from the left menu and click the Banking tab.
- Choose the tile for the bank or credit card account you downloaded the transaction.
- From the Categorized tab, find the transaction you want to unmatch.
- Click Undo from the Action column.
You'll also see this article on dealing with transactions in QBO: Categorize and match online bank transactions in QuickBooks Online.
This article will be useful for your further help and you can read this article at any time: Reconcile an account in QuickBooks Online.
Please send us a message if you have any further questions, and we'll do our best to answer as soon as possible. Take care!
