Next time you might find it easier to model each duplex half in its own PLN file.
Then hotlink the second file into the first - placing a hotlink in a layer that can be turned off when you want to see only the first half.
Or better still create a third file (I would do this for the site plan) and hotlink both duplex halves into it placing the hotlinks in the Archicad layer.
Then you can use your regular layer combinations to view both duplex halves together and you have the separate file for when you want each half on its own.
Barry.
One of the forum moderators.
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