Regarding c.s.t. number?

We have a manufacturing business and now starting up another manufacturing unit in a different city but in the same state. My question is do we need a new C.S.T. number for the new unit or we can use the same C.S.T. number as the new unit is the part of the same company but is involved in a diffrent trade. Please guide me what we are supposed to do and how? thank you.