To understand better what Eduardo is suggesting, see this identical/old topic - which is pre Morph and so uses the wall tool, but same solutions.
http://archicad-talk.graphisoft.com/viewtopic.php?t=292
Rather than a Morph or wall, if the screens on the porch have frames like windows... then use a Window object in a wall and set the glass material for the window to the described surface. Then, you can schedule the screens with elevation previews etc, too.
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