First you will want to delete or modify the rule so that it doesn't occur again. You can do that by clicking (banking/transactions > Rules). Then if you want to delete a rule you can do that but you have to be cautious because a transaction maybe reconciled. 1. If you know the transactions are not reconciled then you could undo them which is essentially a delete feature. To delete a batch you can click in the categorized tab for the bank feeds and search for the rule and click undo. If you have a vendor you can search the vendor list and select a batch and change the category all at once. I prefer this method but it will only work if your rule had the vendor name recorded.