Go to Master > MargSetup > Control Room > Vat setup > Click on Accept > There is one option shown > "VAT APPLICABLE - Y GST APPLICABLE - G" ---Change that option as "G" > Then press esc key and save > Gst changeswindow will be appear > Click on Ok > Hsn creation window will be appear > Create hsn as per the requirement > Then click on OK > Set/change bill format & click on ok.