I don't remember being able to do that (don't have the program in front of me). I believe you need to grab all the surfaces you want to have a different texture and then use 'surface - cut away object.' Set the different texture on the resulting object.
If you need multiple textures on a single surface, then you're out of luck for now... An external program may allow you to accomplish that, but the AC file format doesn't yet allow it.
-- Jeff
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