Thanks for the prompt reply and for sharing the detailed info about your goal, Pankaj.

I'll direct you to the best possible help when it talks about API integrations.

I recommend contacting Intuit Developer Support about API integration with QuickBooks Desktop (QBDT), especially when generating invoices utilizing the line items and templates from the API system.

For future help, you can read this article if you want to learn how to show debit and credit for each transaction: View the Transaction Journal report in QuickBooks Desktop.

For additional queries about modifying your invoice form, leave a comment below. We'll assist you as soon as possible. Take care, and thank you once again.