Question on Isight Optimization Tool

Hello,
I have a question for the Isight Optimization Tool. I am using an .cae for implement my ABAQUS heat transfer simulation and experimental temperature data to fit my simulation data to via Data Machining.
I have 2 temperature curves given by an boundary condition with an analytical field via line on my part and I want to vary these curves with a constant value between 0.1 and 1.2. Is there a possibility to make my variables dependent so that Isight has to vary them in the way that they keep having the same value? Maybe I can define a variable in my input file and change the constant value from my boundary condition to that variable (I dont know if there is that possibility)?
Thanks for your help.