Servicetax on manufacturing

A delhi base mafacturing unit started a plant in west bengal. The company manufactures drums for vendor. But the raw materials is supplying by vendor. The company just fabricated the raw materials and make drums. The company has its ST, Excise & other licence for delhi. Does the company needs seperate ST no for west bengal? Does the company needs seperate excise no for west bengal? Does the company liable to pay excise & service tax?