I'm trying to set up a design study that changes the material property.  I've found that I can add a "Material" parameter, then select "Tensile/Compressive Strength".  My problem is that I only want to vary the tensile strength, while leaving the compressive strength constant.  I don't want them to be the same value.

I have 2 custom materials defined, and when I run the studies separately I'm getting expected results.  What would be ideal is a parameter that just switched from one custom defined material to another, but I'm not finding a way to do this.

Any ideas?  Thanks in advance.