Filing ITR while GST payment is NIL

Dear Sabyasachi,

I couldn't understood your point. Let me further explain my query: I have GST number for my Sanitary Items business since last 2 years wherein I file almost NIL return for all the months. Now I want to file ITR with my different business (Hardware) for which I never applied GST, is that possible. All the businesses are proprietorship only. Now I want to confirm can I file 5 Lac ITR with the business of Hardware with 20 lac sales.