I'd like to make sure we're on the same page, kev-danforth.
Are you referring to a transaction downloaded from your bank? Do you want to remove the payment on the Transactions page? If so, you'll want to exclude it by following these steps:
Go to Transactions on the left panel.
In the Transactions page, filter the transactions by Type, Account, and Date.
Look for the transaction you want to remove, and click the drop-down arrow under the Action column.
Put a check mark on the Exclude this transaction (this is for duplicate, reimbursements, customer refunds, and returned purchases) box.