INTERSECT A WALL WITH A SLOPE

Question

I created a solid wall as a DGN file.

In another DGN file I have my corridor. When I link the DGN containing the wall, I can cross sections cut perfectly and I can see the corridor and the wall.

Now I need to launch a slope that intersects with my wall.
For this I use the "Define target aliasing" tool but I can not choose my wall.

How do I have to proceed correctly?

Thanks

Chris Key · Answer

What type of element/information is the wall? There are only certain types of data that you can target, not just any element or graphic in MicroStation can be utilized. 
 
 From the Help Documents on Target Aliasing: 
 "Target aliasing allows you to target other corridor surfaces or features or to set up a prioritized target list for end condition solutions on surfaces , features and alignments ." 
 
 So you must have one of these types of civil related elements in order to target it. If you have a mesh for the wall, you can try to bring in the mesh as a Terrain Model using the Terrain Model > Create from Elements so you can have it as a model for the target aliasing to recognize.