Return Goods in CST

  Yes, if it is returned within six months after sale,it can be declared in the returns by reducing from the taxable amount,or as refundable also......mjk

You should have proof of selling and returning. Selling through invoice,delivery note and LR(lorry or cargo service documents) and for return a letter and delivery note with a debit/credit note depending on whether it was acredit/cash sale. ....mjk