Here's a template I created based on Bora's work. A Template for Creating Sunbursts in Tableau - Ken Flerlage: Analytics Architecture, Strategy, & Visualization. This may make it a bit easier for you, but this is still designed to to work in a hierarchical fashion where the outer rings sum up to match the inner rings.
Any chance you could provide some sample data showing what you're trying to do?
Thanks Ken. This helps me understand how this works, but still not clear how to make itm work for my case.
Here's a link to what I'm working on:
One of the difficulties is that the data has to be pivoted, which means I'm working with pivot names and values. Not sure how to create a sum value for each ring to get the proper proportion for the slice size.