Ok, reading @will_young 's comment from 04-06-2025 in ideas forum, I think I understand what my confusion was.
To continue trying to help, I now understand that the goal is to show the foundation AND see the contour lines of the entire toposolid (as if nothing had been built yet?) in the same view. That is, you're merging the foundation from the constructed phase with the terrain from the existing phase.
First of all, work correctly with the phases. The toposolid has a tool called "graded region" to create copies of it in the different phases, and to be able to show the excavations/fills.
A pair of approaches come to mind:
Opt 1. The fastest and perhaps least BIM-ish: create two views.
In one, show the foundation level ("New Construction" phase) by turning off the toposolid category.
In the other, ground level, show only the toposolid from the "Existing" phase and in wireframe display style.
In a sheet, align both views.
Opt 2.
Ground floor plan, infinite view range, cut height above ground.
In V/G, turn off EVERYTHING except columns, foundations, and toposolids.
Add a filter to turn off toposolids in the "New Construction" phase.
View discipline: Structural


I leave you the example file (Rvt2026)
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