add a floor to your model by using the building's footprint as a guide and by picking the walls and drawing lines
add additional floors to higher levels by using the Copy/Paste Aligned method of quickly repeating the geometry up through the building
add a specific, alternate material to different parts of the floor by using the Split Face command in conjunction with the paint materials function
split a floor into segments, and add additional points to set a negative elevation for pitching to floor drains
create a shaft opening that will cut out any new floor slab
use symbolic lines within a shaft opening to indicate the opening
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