Basically the custom door leafs use the materials set when they are created and they can't easily be user defined.
It is possible but I am not sure it is worth it.
It has been discussed before here ...
https://archicad-talk.graphisoft.com/viewtopic.php?f=6&t=27956
Barry.
One of the forum moderators.
Versions 6.5 to 27
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