https://www.posetteforever.com/viewtopic.php?f=68&t=2910&p=37105#p37105
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Whazizname
Wednesday, 26 September 2007, 03:56 AM

Re: [Tutorial] Making the most of a freebie auto in Poser
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Then select the "Door" group from the pulldown, and remove the "D_Door" group from it. {Image 6} 
(You may have to go between the "Door" group & "D_Door" group a few times to get all of the problem normals into the "Door" group. Feel free to move your camera around to get the best view of the area you are working on. Don't worry if you add polygons that should not be in the selection; because they are easily removed using the "-" tool.)

Once you have all the problem polygons in the "Door" group & removed from the "D_Door" group, select the "Door" group & click "Reverse Group Normals". {Image 7}