First you need.
1. An Email
2. An XBL Account
3. A Card on the account
4. Active 12 months on the account.




First- Put a card on a XBL account with some active time, doesn't matter whats left just that it be 12 months or what you want to clone.

Next- Call Microsoft asking about removing your CC info from the account. They will tell you they will turn your account to silver
and send you the last time you bought. MEANING - If you bought 12 months and called 7 months in they will still send you a 12 month code

Next- Use this code on your account.

Next- Reply to the email with something like "I tried to use this code and it said it was used on another machine and it wasn't by me. Can I please get some help I really wanna play the live time I paid for."

Furthernmore- Wait for there reply which will be like this - Service Request number:XXX Please accept the following compensation for the previous prepaid token.XXXXX 12 Mo Live Gold (CSR)

Finally- Repeat the last couple of steps every couple of months



ALL DEPENDS ON THE SERVICE REP YOU GET!