To edit low voltage device schedule project settings, go to
Ribbon: DME: Customization->Project Customization-> 
Low Voltage Device Schedule Label Group
Pulldown Menu: DM Electrical->Customization->Labels and Schedules->Project List->Edit Low Voltage Device Schedule Project List
To edit low voltage device schedule standards settings, go to
Ribbon: DME: Customization->Master & Standards Customization-> 
Low Voltage Device Schedule Label Group
Pulldown Menu: DM Electrical->Customization->Labels and Schedules->Standards and Master Lists->Edit Low Voltage Device Schedule Master List
Select Low Voltage Device Group Dialog Box
Select the low voltage device group to be edited and press the OK button.
<Low Voltage Device Group> Schedule Label Display and Order Dialog Box
See the Common Label and Schedule Information section for more information about using the Move Up and Move Down buttons and the Key, Label, Width, Display, and Schedule Title fields.
Values in the Key column are listed alphabetically below.
Callout: The callout of the low voltage device as defined in the low voltage device project schedule.
Quantity: The number of low voltage devices inserted in the project. If a low voltage device type is not inserted, "NOT USED" will be displayed.
Schedule Note 1: Note taken from the schedule.
Schedule Note 2: Note taken from the schedule.
Schedule Note 3: Note taken from the schedule.
Symbol: The block used to represent the low voltage device.