Thanks guys.
After reading those posts again - I'd read them before - can I ask
1. in AC12, a single story could not be more than 100 metres high, though this does not happen very often. Is it right?
If it is, and if we are doing a shed on top of the Everest and not using the "preference-->reference level" way, we'd have to set 89 imaginary stories before we reach our shed level.
2. As for the RL's, It seems that some manual work are still needed because we always mark the ceiling levels besides the floor levels.
Or, how can I do it all at once using, say, the mark Matthew uploaded?
http://archicad-talk.graphisoft.com/viewtopic.php?p=125490
Do I set another level between the levels and call it "ceiling of first floor" etc?
iMac i7 16G / MBP 13" 2.9 i7 8G / Mac mini's - OS X 10.8 - AC 11/12/13/15 [Australia]