If I understand you correctly, you want a single chart with 2 sets of
axes. If so, you can simulate the effect. Visit
http://www.tushar-mehta.com/excel/tips/index.html, scroll down and
click on 'Singe chart with dual axis'

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Regards,

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

In article ,
says...
I easily can add X axis to the excel chart. However, what I need is that I
need to add both a X and Y axis. The reason is that I have charts in SI units
and I want to also show the US Customary units in the same chart. The
original X and Y axes are at the bottom and left. The new axes will be on the
top and right.