Two level label of x-axis?

Hi all!

I would really appreciate your help on this...I am using Sigmaplot and I want to create a vertical bar chart with two levels of labeling at the x-axis.

Thank you very much in advance


Less is more. Stay pure. Stay poor.
Describe in more detail. What do you mean two-levels of labeling, esspecially on a bar chart? Will you be plotting two things? Could you use a another labeled axis?