To place rooms in the building model, open a plan view and use the Room tool.
As an alternative, to create predefined rooms before the model is designed, create a room schedule, and add rooms to the schedule. You can later place these rooms in the model when it is ready.
Room & Area panel
Tag panel
To omit a room tag when you place the room, turn off this option.
For example, if you are adding a room to a Level 1 floor plan, and you want the room to extend from Level 1 to Level 2 or some point above Level 2, specify an Upper Limit of Level 2.
Room panel
Highlight Boundaries. Revit highlights all room-bounding elements in gold, and displays a warning. To see a list of all room-bounding elements in the model, including those that do not display in the current view, click Expand in the warning dialog. To exit the warning and remove the highlighting, click Close.
Select panel
Modify. If you place a room inside bounding elements, it expands to the element boundaries. You can also place a room in a free space or one that is not entirely bounded, and then draw room-bounding elements around the room later. When you add bounding elements, the room expands to the boundaries.