Hi there CDS404,
It's important that all your transactions are entered correctly for your books to be well balanced. QuickBooks Desktop is a great tool able to help you import transactions from your bank to save time with data entry. I can point you in the right direction for assistance with deleting transactions.
in order to know the most efficient way of deleting these unwanted transactions, I recommend reaching out to the QuickBooks Desktop support team outside of the Community. They'll be able to assist you in deleting all of the incorrect transactions so that your books can be well-balanced. You can reach them using the steps provided in the QuickBooks Desktop software support policies
If you have any other questions, feel free to reach out here.