Please go to the invoice >> click on create invoice >> click on bill of supply option >> add the customer and products >> click on save.
Please Note:
The bills of supply invoices will be displayed in GSTR1 report with 0% tax rate.
A Bill of Supply is an invoice that a seller provides for tax-exempt goods during transactions. This document is used by businesses that are not required to pay GST or those that operate under the composition scheme.