Two question in vat and cst registor number?

Dear Experts,

I have tw question kindly help me.

Situation one: "C" of chennai is a manufacturing company, C purchasing raw material from "B" of Banglore."

about "B" of Banglore

''B" - B of banglore is a manufacturing company have a multiple plant at multiple location examble

"B" of Banglore has a plant at Delhi, Mumbai, Kerala and Banglore. "

''C" of Chennai used to purchase goods from "B" of banglore and all the branches Delhi, Mumbai, Kerala and Banglore.

'C' of Chennai and 'B' of Banglore both are registered companies

Question Numbr 1.

'C' of Chennai is submit Form "C" to all the plants seprately delhi plant, mumbai plant like that  (or) we need to submit form "C" to Banglore plant only.

Qustion Number2.

"B" of Banglore need to register seprately in all the location delhi, mumbai , kerala and banglore. ?

kindly explain

 "B" of Banglore has seprate VAT Register number, Service Tax Register Number, CST Register Number and EXice Register Number, ECC Number and TAN Number.

                                      or

 "B" of Banglore has same VAT Register number, Service Tax Register Number, CST Register Number and EXice Register Number, ECC Number and TAN Number.

and kindly explain abt the Company PAN number ( how we need to handle the situation)

Best Regards

Senthil kumar V