If you do not use the Tag on Placement option when creating rooms, you can tag rooms later. 
Note: As an alternative, use the Tag All Not Tagged tool to tag all untagged rooms in a view. This tool can be useful, for example, when you place and tag rooms in a floor plan view, and you want to see tags for the same rooms in a reflected ceiling plan (RCP) view. 
To tag a room
-  Open a plan or section view. 
 
- Click Architecture tab
Room & Area panel
Tag Room drop-down
 (Tag Room). 
 
- On the Options Bar, do the following: 
  
- Indicate the desired orientation of the room tag. 
	 
 
- To include a leader line with the room tag, select Leader. 
	 
 
  Note: When the leader is enabled for a room tag, you may need to move the room tag to see the leader. The leader end will remain in the tagged room.
  
 
 
- Click in a room to place the room tag. 
  
As you place room tags, they align with existing tags. 
  
 
  Note: If rooms overlap where you click to place a tag, then only one room is tagged. If a room in the current model and a room in the linked model overlap, then the room in the current model is tagged. 
  
 
 
 
After placing a room tag, you can modify its properties.