To create or edit a lighting group, go to
Ribbon: DM Electrical->Lighting Groups-> 
Create and Edit Lighting Groups
Pulldown Menu: DM Electrical->Lighting Groups->Create and Edit Lighting Groups
Lighting Group Dialog Box
See the Common Schedule Dialog Box Features section for more information about how this dialog box works. This section describes the Rename, Find, Previous, Next, New, Copy, Save, and Delete buttons.
Check the box beside a setting to change it. See the Common Lighting Group Information section for more information about the lighting group settings.
Add Lights: See the Add Lights To Group section for more information.
Remove Lights: See the Remove Lights from Groups section for more information.
Highlight Lights in Group: See the Highlight Lights in Group section for more information.
Draw as Area: See the Draw Lighting Group section for more information.
Draw as Line: See the Draw Lighting Group section for more information.