As per Notification 78/2020 CT : Taxpayer have aggregate turnover more then 5 crore need to mention 6 digit HSN code for B2B & B2C supply & Below 5 crore 4 digit HSN code need to be mention on only B2B supply. Hence for taxpayer below 5 crore turnover not required to provide HSN code for B2C supply.
There is mandatory to put rate % in hsn wise summary column, so what to put for exempt item rate % as there is no option of exempt in rate % column, or have to put 0% (zero%) in rate % column for exempt supply