removing subscriptions -----

I guess you want the Game Pass only WITHOUT Live Gold, right? in that case, you can access https://account.microsoft.com/services/ and switch off the recurrent billing
option on Game Pass Ultimate, and, when it ends, you can subscribe to the standard Game Pass.

You can cancel your subscriptions by visiting https://account.microsoft.com/services/

Could you be more specific?

Do you mean how do you revert back from game pass ultimate(game pass with live.gold) to standard game pass?

If so, the best thing to do would be to turn OFF recurring billing, and wait till your subscription ends, then simply purchase which ever sub you desire, such as standard game pass.

You can't remove a card while it is tied to an active subscription. In order to remove it immediately, you would have to cancel the subscription. Otherwise, you'd have to wait for the subscription to run out (which is why you'd have to turn off auto-renewal)
and then remove it after the subscription ends.

You should be able to remove it at http://commerce.microsoft.com However, if it is attached to an active subscription, you will not be able to remove it until the subscription
ends or you cancel the subscription.