So this is a difficult quesetion to fully describe.
I've modeled my building, including structural footings, slabs, and retaining walls.
I've also modeled my site from the survey.
Now I want to use "solid element operation" to subtract the building from the site.
I've tried a direct subtract, but that left floating pieces of "site" in my underground parking garage... and that didn't read correctly in my building section.
I've tried a subtraction with vertical extrusion and that didn't work because my structural footings no longer have any ground above them...
Then, just as a fair explanation of my morning thus far, I tried a combination of the 2 steps, and my computer started to lag and lock up heavily.
I think I'm missing some obvious solutions to making this easier.
Any advice would be wonderful.