Pie of pie of pie

[Rash]

The present pie of pie allows us to create pie charts upto 2 level. I want to
create 3 level pie charts(pie of pie of pie). How can I do that?

 

[Jon Peltier]

Edward Tufte once said words to this effect: "The only thing worse than a
pie chart is two pie charts." I imagine that a pie of pie of pie is even
worse. I would try to display the data using a series of column or bar
charts.

- Jon