Use the intuitive interface of MS Excel to manage your GST compliance. GSTR-3B and GSTR-1 template is being widely used.
Step 1: Download Excel Template
Step 2: Enter / Import Sales and Purchases details
Step 3: Correct mistakes (if any) that is prompted by the Excel sheet
Step 4: Export to GSTplus.com to get your GSTR-3B
Step 5: Export to GSTR-1 (with the same template)
More details on https://gstplus.com/excel #zip