Sigma Plot

How to Combine two Contour Plot in a single Contour plot Sigmplot software

Hello Everyone,

I want to plot a 2-d contour graph in sigma plot but I have 4 data-sets (x,y,z1,z2). I am using sigma plot v.12 I have already created two contour plot in this software with only three variable one is from (x,y,z) and second is from (x,y,w).
The first question, Is there any option is available in this software, where I can combine this two plot in a single plot.
The second question, Is there any option where I can plot a contour curve with 4 variable data sets. I have also attached the two images of plots
please reply
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