You cannot "pause" or "postpone" an Xbox subscription midpoint. The term is fixed. However, you control renewal and stacking:
If you have Gold time left, buying **1 month of Game Pass Ultimate ($16.99)** converts **all remaining Gold time to Ultimate 1:1** (includes Gold + Game Pass PC/Console + Cloud). One-time conversion per account.
An Ultimate subscriber can share benefits with 4 other accounts via Xbox Family Settings app. Not a "pause," but splits cost.
No Refunds for unused time on cancelled subscriptions (per Microsoft policy).