Equation editing in Structural physics in Comsol 4.0

Hi Everyone,

I was exploring comsol 4.0. I found that the GUI is good but some functionalities in 3.5a are removed.

I wanted to edit the Structural physics equation system to suit my PDE. In comsol 3.5a, I could do it by going to Physics menu>Equation system. In comsol 4.0, I couldn;t find the option. Does anyone know how to do it?

One more question, how to use the unitless system in comsol 4.0?

Thanks in advance,
Rakesh