This is in response to a question in general Civil 3D fouinf here:
https://forums.augi.com/showthread.php?176086-How-to-show-specific-points-in-the-section-view-on-the-sample-line
The question posed was related to how one might do building slabs using the corridor.
There is no narrative to explain some of the finer points of the process that is used.
There is a workflow that one would develop, to do this, if one did this frequently.
Some of the information/explanation is embedded withing the DESCRIPTION section
of the objects/features utilized within the example.
I will attempt to answer any questions in a timely fashion.
Enjoy the exploration!
Building Slabs.png