Multiple chart types

Hi everyone,

I would like to know if it's possible to combine a couple of chart types. I currently have a bar chart showing total number of open issues against who's responsible for them, with the bars split vertically (stacked on top of each other) to show issues that have been open 1 week, 2 weeks etc.

What I'd like to do is keep the same kind of graph (the vertically stacked bars) but also with grouped bars to show design, build & test issues for each person.

Is this possible?

And if that makes no sense at all then let me know and I'll try to clarify further (I know what I want, I just can't figure out how to do it or properly describe it).

Many thanks in advance for any help,

Rob