Bruce,

You can't elevate rooms (or ceilings). Floors are always, really, on the floor and ceilings are a result of wall heigth.

Here's a tutorial how you can create a building with multiple floors.

Shorthand explanation: build your upper floors as if they were ground floors. export them as OBJ, then import them as furniture. Give them the correct elevation and stack them on top of the ground floor.

Using the new functions of SH3D (introduced after writing that tutorial) and the Copy as new furniture plug-in you could simplify your workflow.


Hans