Central excise general procedures

Can anyone please advice me in this regard!!!

Suppose 50 tons of goods are used for manufacture in a factory, out of which 30 tons are excisable and remaining 20 tons are non-excisable.

Input duty paid for the manufacture of final product is 2lakhs out of which I can attribute 1.2K to excisable and remaining i have to bear the expense.

Then what is the information i have to produce in RG-23 Part I and RG-23 Part II (regarding the 50 tons i have to produce the info. or regarding the 30 tons i have to produce the info.)

I need an expert advice in this regard.

Thank You