Use object classes to create new objects with a predefined set of properties and values.
To create a classified drawing object
If no object classes are listed in Map Explorer, attach an object class definition file. For information on the location of the object class definition file, consult your CAD Manager.
When you create the object, object data, external data, and topology data are attached. Other properties included in the object class definition are set to the current drawing setting. If this setting is not within the range of allowable values for this property, the default value is used.