AJP Excel Information

Tricks with Pie charts

Pie In Pie

Pie in Pie with conditional formatting. 
The inner segment effects are controlled by worksheet formula.

Pie By Pie

Doughnut with filled hole

The workbook contains examples of the following pie chart tricks.
With a step by step explanations. All the examples are based on a single chart using the secondary axis.
So NO overlaying of 2 separate charts.

Alternative links

Jon Peltier's Tech Trax article 'Pie of pie charts and other pie charts tricks'