How can I disable floors (planes)?

[DeAngelo]

I found the easiest way to do something like this in one of my maps was to take a random object (I use paintings since they're flat), then in the model editor line the area slightly above it with billboards of the floor texture you want to use. Make sure the body matches up to where the floor billboards are. Then just put as many into your level as how much floor you need, then despawn them when the time comes.