To understand from BUSY which invoices have local and IGST applied, you need to follow the below steps:
Step 1: Go to Display, then select GST Reports, then select GST Registers,
Step 2: then select Supply Outward Register, then select All party,
Step 3: then select correct date range, and then select the relevant information and then press F2 or OK,
Step 4: These reports will provide party-wise and invoice-wise details of CGST, SGST, and IGST applied.
Step 5: You can understand from BUSY which invoices have local and IGST applied.