To define an enumeration group
The group name cannot begin with a numeral or contain spaces or special characters.
The item name cannot begin with a numeral or contain spaces or special characters.
The Display Name is the item name that is displayed in AutoCAD Civil 3D. By default, the Display Name is identical to the Enum Item name, but you can specify a unique Display Name.
The display name cannot begin with a numeral or contain spaces or special characters.