How do I add an XBOX Live account to a preexisting one?

I have an account on my xbox 360 with xbox live. I recently just added a new account to my xbox, but it does not have xbox live. How do I put xbox live on the new account without buying a new live card?How do I add an XBOX Live account to a preexisting one?
You can't. It's one Live card per account. You can have multiple accounts only if you buy the Family Pack which includes 1 parent and 3 child accounts.How do I add an XBOX Live account to a preexisting one?
shut up no-one likes you because you're a pussy,

oh and you can't dumbass

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How do I add an XBOX Live account to a preexisting one?
You cant