Originally Posted by hurnik

It used to be you would login to your Citi account (the one with the checking) and somewhere is an option to LINK CARD and then you could add the credit cards.

Personally I would NOT do this. If you ever close your Citi Checking/Savings account, Citi will "unlink" it, but it will then make you lose access to the "combined" accounts and you'll have to call and have them delink all the credit cards and you'll have to create a brand new userid in order to re-add them.