Hey Echo, thanks very much for taking the time to respond.  Unfortunately,
that didn't do what I needed.  Clicking "categories in reverse order" put the
axis at the top of the chart instead of the bottom, which isn't really what I
wanted.  Also, it didn't reverse the order the of data and it didn't reverse
the order of the legend.  

In more detail, here's my problem - I have a vertical stacked column chart
with the series in rows.  In Column A of the datasheet I have the Average.  
The first percentage associate with the average is 30% (cell A1).  The second
percentage is 50%.  

On the slide the item listed at the top of the legend (when the legend is
displayed to the right of the graph) is Percenatage B and below that is
Percentage A.  On the chart, the axis is at the bottom of the page and 30% is
the first percentage which borders the axis.  On top of the 30% is 50%.  

Basically, I need to reverse the order - I need the 50% to be the first off
of the axis with 30% then on top of it.  Also, I need the legend to display
Percentage A on top, and then Percentage B below that.  

I realize this is long and complicated, but hopefully someone might know
what I'm talking about.  Thanks to anyone who took the time to actually read
this.