Use the Level tool to define a vertical height or story within a building. You create a level for each known story or other needed reference of the building (for example, first floor, top of wall, or bottom of foundation). To add levels, you must be in a 3D view. When you add levels, an associated plan view is created.
Levels are finite horizontal planes that act as a reference for level-hosted elements, such as mass floors. You can resize their extents so that they do not display in certain views. For more information, see GUID-4E36EDA0-2F4E-4619-B568-AC758E8D9770.htm#WSFACF1429558A55DE1E15DFEFE679E0029-7FC2.
You can hide level annotations after you add them. For more information, see Hiding Elements in a View.