Parameter computation in Integrity Modeler

Hello Community,

I want to know if there is any chance to solve the simple problem to map one parameter on another one.
So in this example that it will set automatically the "Rohrdurchmesser" to the "Bohrungsdurchmesser".

And is there any way to use the constraint blocks for simple equations or do I have to use Simulink for this problem? 

Regards,
Tabea