It's my priority to help you with exporting your invoices accordingly, @ashish91tulsian.
As per section 16 of the IGST Act, 2017, the export of goods and services is treated as a zero-rated supply. This means that the GST would not apply to the export of any kind of goods or services. Since selecting the GST 0% saves the payment of GST, you need to choose the GST exempt option.
To learn more about the zero-rated supplies and Letter of Undertaking, you can check out these links:
If you have any other follow-up questions, let me know by adding a comment below. I'm more than happy to help. Keep safe!
