Are 3 dimension pie charts possible?

[#1]

I have a pie chart stacked on top of another pie chart.  When I add a third dimension, it does not add an even smaller pie chart on top of the previous 2.

If this design isn't possible, what is a good alternative?  We want to see how many hours were spent working on a project by department, project, developer.  A triple stacked pie chart would work wonderfully, as we are trying to see all 3 measures at once with as minimal amount of charts spread over the sheet as possible.

Thank you

[srinivasa1]

Use Trellis chart

[hic]

... or a grid chart:

HIC

[#4 · Accepted solution]

Thanks for the suggestions.  The grid chart worked, but we had too many records to make any sense of the visuals.  Ended up deciding to go with 3 separate funnel charts, with the largest values being on top first.