by Chris Tyler:
Fundamentals Exercise: Scaling Elements
This fundamentals exercise shows how to simply scale geometry at the element level.
Note: After opening the start file, select the XYZ object (the default tool is the Move tool which selects objects), go to the Modeling menu, then select Edit Object. This will enter polygon edit mode.
To select the Z polygons as shown at the beginning of the tutorial, click a single Z polygon, then press Option+? (this is a Select Connected command).