For disclosure of stock in hand as on appointed day, please refer the draft transition format rule. Further may refer to revised draft transition rules if require more detail understanding.
Please refer the below link http://www.cbec.gov.in/resources//htdocs-cbec/gst/transition-formats-04062017.pdf
Further, GSTR 1 and 2 are for disclosure of sales and purchase and not for stock in hand.
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