HU,
I'm pretty dense, do you mean a false cavity bottom or around the outside of an island (for lack of better word)?
If you mean a cavity bottom, it will be machined (ie: feed) just as if your false bottom was in fact the real bottom.
Around the outside would depend on what was in the way(ie: it would see the model parts and not go thru them) so it might go to clearance before it moves.
Maybe I don't understand the question. If not try to set me staight.
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