In grid view, select Site -> Floor. Within this view you can add and remove floors.
After creating a floor the order can by changed by clicking on one or more row headers and clicking and dragging the row header around.
To create a bulk amount of floors at once, there is a convenient right-click option to Create multiple floors.
All you need to do is enter a range of floors to create and then that amount of floors will be automatically created for you with default labels.
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