Create a profile from a 3D element

Greetings everyone, I am trying to create two profile lines which describe the upper and lower surface of a tunnel.I tried to use quick profile from surface, as well as profile by 3D element but it does not seem to work. Tried also with dgn and dwg, as reference or merge into master.

Am I missing something? Should one begin from a 2D or a 3D view? What are the requirements?

The model used as a base is a 3D describing a tunnel for metro.

Thank you in advance.

Filipp Zarov