The main sections which are needed for GSTR-1 report in BUSY are:
Step 1: 4A, 4B, 4C, 6B, 6C - B2B Invoices
Step 2: 5A, 5B - B2C (Large) Invoices
Step 3: 6A - Exports Invoices
Step 4: 7 - B2C (Others)
Step 5: 8A, 8B, 8C, 8D - Nil Rated Supplies
Step 6: 9 - Non-GST Outward Supplies
Step 7: 10 - Amendments to Outward Supply Invoices
Step 8: 11A (1), 11A (2) - Tax Liability (Advances Received)
Step 9: 11B (1), 11B (2) - Adjustment of Advances
Step 10: 12 - HSN-wise Summary of Outward Supplies
Step 11: 13 - Documents Issued