One method is to create the gerbers from one design and import them into the other. (OrCAD menu = Import > More > Artwork; Allegro menu = File > Import > Artwork) Create user defined subclasses in the Board Geometry class (OrCAD menu = Setup > More > Subclasses; Allegro menu = Setup > Subclasses) and import the gerbers there. You then enable the etch layer and it's corresponding layer that you imported.
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