Release a Matched Card Account
If you have matched a card import to a specific account, and wish to disconnect them, there are two ways to do this.
Card Import Match
Click the Card import & match link, from the Accounts section on the Dashboard.
Open the statement which has the matched account on it.
Select the card number that you want to release.
Use the Release button.
When the account is released, you will notice the link option appears next to the card.