H1 Transfer (L1(company A) to H1(company B) to H1 (company C)

[kakanroy]

Hi,
I work for company A and currently in L1 visa. I have got H1 visa from company B. However, I did not start working for company B yet. In the mean time I want to see if I can join company C if they do H1 transfer without joining company B. is it mandatory to join company B for me to get H1 transfer done to company C?