You can write TDL to auto-populate fields based on logic. Example: If the customer’s state is “Maharashtra,” automatically set the transport mode to “Road” and print an extra copy for the Sales Tax department.
TDL for Tally.ERP 9 is a double-edged sword. It is intuitive and powerful for those who know it, but obscure and frustrating for those who don't. tdl for tally erp 9