Creating a 2D extraction from a 3D model (a slice of the 3D model)

Question

Using either Microstation V8i or AECOsim Building Designer V8i in conjunction with Bently ProjectWise. I am trying to create a 2D 'extraction' from a 3D model (I understand what a Clip Volume is and this is not what I am after so, please do not say to clip volume!) I have a 3D model of a London Underground tube station and I would like to produce a 2D drawing just like what is shown below. This is essentially a slice of the 3D building .Normally you would not be able to see whats inside unless you turn off the levels. I want to keep all levels on and cut through so it removes the front and back walls and only leaves the transverse walls and the ceilings/floors. The slice here is quite thick so you can just see the staircase. 
 
 This is exactly what I want to be able to do but, I dont know how. Could anyone show me a step by step way of producing this 'extraction' from a 3D model please. 
 If you need more info please let me know. 
 Regards 
 Matthew Edwards

jpln · Answer

First this is not probably the best place to ask for this as it is something used more in building than in rail design. 
I probably miss something in the explanation as it really looks like the clip volume functionality. So maybe the difference is that you want a 2D model with no reference to the 3D model. Am I correct ? 
I don't know any way to do this. Because the 3D model is really required here. if you merge the 3D model into the master (even sheet model) you will get all the 3D elements flattened in the master model. 
A workaround could be to use a Rail Track SS4 (or Power Inroads) and sections. In this case it creates elements, no link with the model. But you will probably loose a lot of details, especially annotations, patterns. You will get only the cut from meshes and solids. Because it is really a the edge (even beyond) of the function I can't guaranty the result. I already did it many times, and it was cool as a Rail designer, but not on a completed building with doors, windows, etc.