If a transaction like bill has been marked as paid in QuickBooks and payment has been downloaded from the bank feed, you can match the bill payment. Matching a downloaded transaction with one you already entered links them together so you don't get duplicates.
Here's how:
Find a downloaded transaction with the Match option in the Action column.
Note the Date, Description, Payee, and amount spent or received.
Select the downloaded transaction to expand the view.
Review the Matching records found in QuickBooks. This is the possible matching transaction you already entered in QuickBooks.
Select the link next to each match to get more details.
Make sure this is the correct match. In particular, review the Deposit to, Payment method, and Bank account fields on forms for the existing transaction in QuickBooks.
If this is the correct match, close the open transaction.