How do I do this simple thing?

 From:  duke
I know how I'd do this in a poly-modeller, and in sketchup i'd just draw the main square then draw the other two lines and extrude it, but how do I do this in MoI? I want to grab the smaller box and extrude it and have everything be one piece.

EDITED: 11 Aug 2008 by DUKE

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