Hi,

Every company ahd a different P.F estd code that is prefixed with your PF account Number. In case you join company C it is the duty if Comoany C to prcess your transfer in Form - 13, which will require information of your previous PF account number in company B. If you have a PF account number in company B then the transfer takes place automatically from B to C through Form - 13. If You havn't yet received your Account Nomber in Company - B, then your primary duty would be to collect it and then apply for tranfer in Company C.

Regards
Prithvi