Use the Options bar to add or remove lights in a light group. 
-  Open a project view that displays lighting fixtures. 
 
- Select a lighting fixture. 
 
- To add the lighting fixture to a light group, do the following: 
- On the Options Bar, for Light Group, select the desired group. 
If the light group does not yet exist, select Edit/New, and create a group. 
  
- At the prompt, click OK. 
 
  
- To remove the lighting fixture from a light group, do the following: 
- On the Options Bar, for Light Group, select None. 
 
- At the prompt, click OK.