in GSTR-1, Table of B2cs you are write net value as taxable value. for example. My sales is Rs. 10,000(Taxable value), CDNR is Rs. 1,500(taxable value), then net off is Rs. 9000 is your taxable value of B2cs.
@ shailendra sir if you have sold goods to urd who is in different State and bill value is more than 2.5 lakhs then you need to show separately in Gstr 1 and for the same bill you can show credit note in 9b other Wise what mit sir told that is crct