Card that relates design variables

Hello everyone,

I am running composite size optimizations and I came across a problem. I need to relate the thickness of different design variables (plies), however, there are no constraints available that address this issue.

Is there any CARD that allows me to create such a constraint?

*actually, the dependent design variables should be in a specific thickness range (e.g., 0.5t<t1<t), where t is the thickness of the 'main design variable' and t1 the other design variables.