@sharpdrivetek there is now new concept called Tax Reporting Category under Settings tab.

You should create tax reporting categories such as
- CGST
- UTGST
etc.
Then assign tax reporting category to each tax code (in case of multi-rate tax codes, to each rate)
Then tax reporting categories are available in dropdown under Report Transformations.
This will allow you to create Indian country-specific tax report reporting figures on individual tax reporting categories.
Do not use custom field on tax codes anymore. Such a custom field should be deleted.