Step 1: create the C-corporation.Step 2: the member(s) of the LLCs either sell or give their interest(s) in the LLCs to the C-corporation, doing so by a contract (signed by an officer of the C-corp) where the members get something in return for doing so--either payment, or at least the C-corp. taking over any potential liability of the members from or for the LLCs and agreeing to "indemnify" the members for any debts, obligations, or liability. And yes: if it's the same person one both sides (e.g. you), you can sign in your dual capacities as corporate officer and managing LLC member.It's really quite straightforward.