There are following ways to record exempt and nil rated sales as mentioned below:
Step 1: Create Item master or select an existing item.
Step 2: In the Item Master, select the Tax Category as Exempt.
Step 3: Then go to Transactions tab then click on Sales/Supply outward.
Step 4: In the Sale Invoice, enter the details Series, Voucher date, Voucher Number,
then it will ask for Sales Type so have to choose local or central - Itemwise.
Step 5: Then while checking your GSTR 1 report, make Y to Show Exempt/NR/ZR Entries in Taxable Invoice Separately option,
it will reflect the data in Section 8 nil rate, exempted and non gst.