This has been asked for a few times.
Seems quite simple to do for a single element but I think the problem would be with multiple elements.
These could be from different storeys but your plan can only show one storey at a time.
So what would it show?
This is my guess as to why we don't have this feature.
There was discussion on possible options and workarounds in the other wishes if I remember correctly.
It is just a matter of finding them.
Here is one post I managed to find.
http://archicad-talk.graphisoft.com/viewtopic.php?p=244685&highlight=select+plan+elevation#244685
Barry.
One of the forum moderators.
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