Inner radius of a pie chart to a column chart

Hi Gurus,

My requirement is Pie chart contains some values if user clicks on inner radius of pie corresponding chart has to be displayed.

Please check the below chart for clarity

Image may be NSFW.
Clik here to view.

Here initially user will choose either "Main cause" or "Sub cause" then if he selects "People Related" then corresponding people related chart has to be displayed below which is of Main cause.

Please help in how to achieve this.

Regards,

Anjali