It's things like these that make me happy to work in NL where, for the most part, terrain is flat like a pancake.
You could maybe dice up the terrain in such a way that you can hide the parts you do not want to see on certain elevations. Either hide them by having a layer like Terrain West Elevation Hidden or use the renovation tool.
With diced up terrain and graphical overrides in ArchiCAD20, maybe you can achieve what you want (setting a transparant cut fill and a dashed cut line, etc).
It would probably still be faster to fake it, though.
Maybe ArchiCAD 24 will have all these bells and whistles as we enter the 2020s
😉
Erwin Edel, Project Lead, Leloup Architecten
www.leloup.nlArchiCAD 9-26NED FULL
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