Dadra and Nagar Haveli and Daman and Diu GST State code is not available

Thanks for reaching out to the Community, @aditya3.

You can set up GST for Dadra and Nagar Haveli and Daman and Diu. Here's what you'll need to do:

1. In the left menu, click Taxes. 
2. Tap Edit GST drop-down button and choose Edit rates.
3. Hit Add tax rate at the upper right hand. 
4. Enter Tax name, Description, and pick Tax agency.
5. Fill in the necessary information. 
6. Hit Save when done. 

To know more about how GST works in QuickBooks Online (QBO), see these articles:

• Setting up QuickBooks for GST
• How GST impacts QuickBooks users

Get back to me if you have further questions when setting up taxes. I'd be more than happy to offer help. Have a great day!