Vat credit

Hello Guyzz....I have an problem..as i m engaged in business of ceramics and marbles in mumbai "MUMBAI".

I purchased goods from manufacturer of product in which i dealt in "GUJARAT" against "C". I paid cst @ 2% on total amount(Incl.of Excise Duty). Now i sale such goods in mumbai and collect vat @ 12.5% from buyer.

Now i have to fill vat return . Can i avail credit of cst @ 2% against vat 12.5%.

Suggest please.