If you get the CC before SB then the CC user will be active and you have to link the CC user ID with the SB by just submitting the account linking form/via net banking.
We can make the savings account ID as primary ID and link the credit card IDs to it. If you already had a login before opening the account, then after linking the credit card to the new savings account ID, old one stops to work. I did it myself and that is why I am telling.