Old stock

If you have excise separately levied invoices ,claim full cenvat credit on such invoices .If you do not have excise separately charged invoices,claim 60% of CGST(i.e.14% × 60%=i.e.Rs.8.40 per Rs.100 )by filing Trans No.2 in each month of sales of such stock upto 6 months.No credit on CST.You have to sell your old stock at GST rate itself.But,if you avail the above discussed credits,normally ,your net sales price would not exceed the pre GST rate .