1.
Select Help > Sample Data Library and open Companies.jmp.
2.
Select Graph > Chart.
3.
Select Type and click Categories, X, Levels.
4.
Select Size Co and click Categories, X, Levels.
5.
Select Sales ($M) and click Statistics.
6.
Select Mean from the menu of statistics.
7.
8.
Select Stack Bars from the red triangle menu for Chart.
Example of a Stacked Bar Chart

Help created on 9/19/2017