Even if you could make a 3D stacked column chart, it would be nearly
impossible to interpret. Actually you can fake it, but in the interests of
good data presentation practice I no longer share the technique. Just
because you can do something does not mean you should.
An alternative for a 3D unstacked column chart is a simple 2D clustered
column chart. You don't get that fake impression of depth that marketeers
like so much, but you also don't get the distortion that false perspective
imposes on a display. It is much easier to compare values on a 2D chart, and
you can make the chart two ways, clustering by worksheet rows or by columns,
depending on how you want to show the information.
You can also fake Excel into making a stacked plus clustered column chart. I
link to a few examples on this page:
http://peltiertech.com/Excel/ChartsHowTo/ClusterStack.html
- Jon