thanks for your reply.

I am attending a parametric design with Je+. In Je+ I can modify the idf file applying a list of value per each parameter that I consider. In this case, I have to vary the overhang's depth. Into idf file I have not the overhang as a object but a several groups of shading surfaces and for these I can't vary the depth.

So, I have drawn the model in sketchup, then I have setted the schedule and other in OS, now I have to define the parametric design, but I need to e+ to adjust some variables.