Splitting sat cable

[funkyboogalooo]

Hope someone can help. Ive just ordered sky+ HD to replace my standard sky+. I have told my son he can have my old sky+ box but I am aware he will need 2 cables rather than the one he has at the moment. Is this something I can do myself (basically can I buy the bits anywhere) or do I need to pay sky?
Cheers
Mike

[funkyboogalooo]

We have multi room so thats good but I don't know whether we have a quad out.
I'll have to investigate further me thinks