There is no direct command in AutoCAD to do a non-uniform scale, but there are two, in my experience, tricks to do this. With the help blocks and lisp utility, ScaleXYZ from xanadu.cz.

Scaling with BLOCK command

Quote from CAD Forum:

If you want to scale an object, or a group of objects, or the whole DWG drawing with different (independent) values of X-, Y- and Z-scales, you can use blocks.
Non-uniform scaling (resizing) can be done by enclosing the scaled entities into a block and then reinserting this block in a non-uniform scale (X/Y/Z).

How to:

1. Create a new block or type BLOCK in command.

2. Select object and specify the base point.

3. After create block, INSERT it and fill different value in Scale option. OK.

Scaling with Lisp utility, ScaleXYZ

1. Download the free lisp utility, in www.xanadu.cz/en/download
2. Load in AutoCAD Tools menu -> AutoLISP -> Load Application…
3. Select the file, scalexyz.vlx
4. After it loaded, use command either scalex or scaley or scalez to scale the object(s) non-uniformly.
Note: the AutoLISP feature is not available in AutoCAD LT version.

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