Linked models and toposolid workflow - can't cut links

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How do you deal with toposolid when working with multiple objects? Standard workflow: create site project - create toposolid in it - link building models into site project - link site back into building projects.

The issue is that toposurfaces were smart enough to know they don't have priority over building elements so they didn't show through walls, floors or foundations.

Toposolid doesn't know that so it ends up overlapping with the building, but since site is linked into project you can't use cut.

I know I could theoretically create voids in the project file that follow building elements, copy/paste them into site file, cut toposolid there... But even writing that down sounds pretty nightmarish.

The only thing I came up is to completely hide toposolid in sections and draw a filled region, which is a pretty dumb way of doing it in BIM.

Am I missing something obvious since I can't google anything on this subject? How do you deal with this?

Desired result:

Linked toposolid result:

[SteveKStafford]

If a separate site model is ideal for other reasons then creating voids that alter the terrain to define the relationship with the building properly is the approach I'd pursue. You could simulate excavation for the foundation by removing as much as the contractor would to do the work, conceptually. Then you could use additional toposolids to represent backfill etc. It all depends on how closely you'd like to represent the relationship and construction sequence.

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Toposolid really is one step forward two steps back.

[SteveKStafford]

Well we couldn't cut topography in a link before either so separating site into a different model has always had a downside. But for me keeping them separate has always been better than putting it in with the building...except for tiny projects.

[ToanDN]

I think OP means graphic hierarchy.  If the toposolid and the building in the same model, the cut pattern of the toposolid stays behind other model elements, even they are not cutting.  but if the toposolid is in a link, its cut pattern stays in front.

[mhiserZFHXS]

Nah, its about 10 steps forward and 2 steps back. Yea, it created a couple new issues, but the new system is much better overall and hopefully those new issues are fixed quickly. Several ideas have already been accepted to do this on the ideas board.