I am in front of the same question right now, although half a year later.
does anybody knows the answer ?
At the beginning of a project makes sense to play around with the volumes of the program without having to deal with walls and slabs.
If you want to play around with volumes, you could use Slabs or Meshes to create those Volumes. Those will appear in Sections and you will be able to modify their height values.
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Thomas wrote: How about a 3D parallell projection, and (if needed) a 3D Cut?
That's a good one. Had used it for zone isos and perspectives, never thought of using it for 'zones sections'. And with a 3D Document you can annotate it, etc.
