how do i add a z or third axis to my chart?
 

I am trying to plot percentage costs vs time and I would like to show sales
vol on a third axis.

XL doesn't do real 3D charts. See Andy Pope's simulation of
3d XY Scatter Chart
http://andypope.info/charts/3drotate.htm

and my notes on
3D Surface
http://www.tushar-mehta.com/excel/ch...ace/index.html

--
Regards,

Tushar Mehta
www.tushar-mehta.com
Excel, PowerPoint, and VBA add-ins, tutorials
Custom MS Office productivity solutions

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says...
I am trying to plot percentage costs vs time and I would like to show sales
vol on a third axis.