Re: Defining surfaces and other new questions....
Oh no, sorry for any confusion--cutting it after the fact works very well, too.
Weld and unweld do as you might expect. Weld takes multiple vertices that are snapped to the same location, and welds them into a single vertex. Unweld does the opposite; it takes a shared vertex (i.e. the corner where several surfaces meet) and splits it into multiple vertices. This is one way you could cut a shape apart.
You can also use Surface > Cut Away Object to remove a chunk of a shape and make it into its own object. Finally, there's also a knife tool on the object menu that's sometimes handy for this purpose.
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