Tax free goods stock & sale under gst regime

Friends,

One query.

I am pure reseller in Food Grains i.e. Wheat, Rice, Toor Dal etc & registered under MVAT & CST.

I will be having Closing Stock as on 30/06/2017.

Now, in this stock, there r purchases from out of Mah. as well as MS purchases.

In certain OMS purchases, the supplier always charges VAT/CST.

So, What will be position for Set-off Carry forward for such VAT/CST paid purchases of which goods r balance in closing stock ?

Shall I file stock cf statement and claim ITC for such CST paid stock ?

Pl guide.

T & R

K P Bhanushali