HSN FOR GSTR1

Asif Ali (B.Com) (323 Points)

12 October 2022  
Dear Sir,
I have 959 bills=B2C
and 1 bill is = B2B
My query is hsn code is optional in b2c case while filing gstr1 and mandatory im case of b2b sale.
should I file hsn code only 1 sale bill or all sale bills in gstr1.?
Thanks...