Jim
Just sent you a PM, but here the advice is reproduced for anyone else that is interested:
Jim
Create the chart using the type "Stacked Bar Chart". Once created, select (ie click on) one of the bars - this should select the entire series. Right-click and choose Format Data Series. Select the Axis tab and choose the option "Plot on secondary Axis". Next choose the Options tab and here you can play around with the "Overlap" and "Gap Width" options - this should allow you to do what you want.
Best regards
Richard