Please Help: CVD

We are the manufacturing of agricultural products like harvester and tractor and we are imported the parts of these agricultural products from outside india and sold the final products in india or outside india.

Sir, i want to know that in india parts purchased for tractor and harvester are liable to excise duty and final product is exempt from excise duty.

In case of imported parts whether CVD ( equal to excise duty in india) levied or not or credit of Additional duties of excise will be available or not.

pls clarify