Ken, I've done this by creating cutouts of the proper size (tiny) using say four 1mil holes on 5mil pads. I included on the Drill Drawing a detail showing routing a rectangular cutout from these sets of 1mil holes. You _must specify_ "Plate Through" for all these special cutouts. Note that you won't get absolutely square corners due to the radius of the routing tool; the fab house can tell you what their minimum radius is. Be sure to allow for the corner radii and routing tolerance (usually 3mils excess for tolerance at each corner) in sizing the cutouts.
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