clip a 3d solid from a corridor

Hello, 

I would like to make a cut in a corridor sidewalk because I have to model a ford/crossing (like the picture). I use OPENROADS DESIGNER.

My idea is to place a solid 3D (the blue one in the picture), and clip it from the corridor.

After that, place in the correct site a solid 3D with the correct "wedge" shape.

But the problema I found, is that : 1) I cant use "Cut solid" neither "Difference Feature", between a solid 3D and a part of a corridor. And 2) If I place a shape (drawing 2D) and use "clipping reference corridor", the program make a total cut of all width, and I only need to cut a defined volumen, only the superficial layer, not every one!

How could I solve this problema? What would be the best way to model this?

Thank you very much,

Patricia Manzanero