Apologies for the confusing question, it is in 2 parts.

I own a CC and I want to go into business with a partner. He will only have "shares/membership status" in the new division but we want to keep the new division as part of the original CC.

1st Can I open this new company as a division within the existing CC, to keep the admin and returns etc to a minimum?
2nd How do I satisfy my partner that his profit share would be safe if this were the case?

Of course this could be completely impossible?

I appreciate your help.