We are going from Calcutta(India) to Kumming and then from KM to Bejing.What procedures do we have to follow during this transfer?

You need to follow these steps to finish the transfer:
STEP1: Inspection & Quarantine, Exit and Entry Frontier Inspection
STEP2: Baggage Claim
STEP3: Customs Inspection
STEP4: Going through Transfer Formalities
STEP5: Security check
STEP6: Waiting & Boarding

For transfering, it is suggested to prepare about two hours to make it.