When you add a credit card, you are adding a credit card as a subaccount of a card issuer account. One issuer account can have multiple credit cards as subaccounts. For example, let’s suppose you have an oil company issuer account and 20 employees. You can add 20 cards to that issuer account, one for each employee.
When you need to reconcile your account, all the credit cards appear in the reconciling grid under the names of the credit cards so that you can understand the charges for each employee.