for filing itr 4 some query

sir if I had received small salary from my employer then I filled my gross salary in the itr column and not need to filed any other column. is it right or not?

As such right, but you can claim standard deduction upto Rs. 40,000/- over the salary income.

Second what code we have to use for boutique business

'21001'

and general commission agent  is

'9005'