You will need to enter all your transactions as nil-rated or exempt, you need to follow these steps:
Step 1:Go to Transactions menu,
Step 2:Add sales voucher,
Step 3:select a sale type as nil rated or exempt,enter all details of voucher then save.
Step 4:Then you can go to Display menu,
Step 5:Click Gst Reports,
Step 6:Click Gst returns,
Step 7:Click GSTR 1 Report, select filing frequency, after that, open the report,you will see that transactions in the section-8 nil rated, exempted and Non Gst
Step 8:Click GSTR3B Report, in this report you see the nil rated and exempted transaction in the section of 3.1(c) other outward supp.(nil rated,exempted).
And when you upload the GSTR-1 and GSTR-3B returns, the data will also be displayed in the same section on the portal.