In the Chart setup tab, similar to an inspector tab, select the CHART area, and you will find a chart Type selector just below the chart's title. That selector includes an option for Stacked Column.
You must define multiple Axis to track along the X or Y to create the stacking effect for that axis. Only the Bubble chart offers a form of 3rd axis.
Note that stacked bar and bubble charts were only added in FM12 - if you are using FM11 (you didn't say which version) then stacked bar charts are not available..
Thanks I can setup a stacked bar chart but have not been able to add the second series field to automatically divide the bars. I have tried creating a table with subsummaries and charting that but it also does not work. I need a proper manual or tutorial that does not seem to exist in FMP documentation
Check out FM Academy's new series of free webinars called 12 Days of FileMaker 12.
They did one last week on charting that is a good Re-introduction to charting, including the new chart types in 12.
Disclaimer: I am not affiliated with FMA, just enjoying their new webinars.