Not sure exactly what you are intending, but if you mean to make a new material zone.. Use the grouping tool, select the poly/faces you wish to have the new material, click assign materials and give it a name. Leave the grouping tool and save the object to your library. Poser should make a new object that has the new material you made assigned to the poly/faces you designated.

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Consider me insane if you wish, but is your reality any better?