User-defined properties for change orders can be created in the Property Definitions dialog.
These properties belong to the change order itself and not its contents.
All change orders (new or existing) will have this property associated with it and can be edited as desired. Editing the property can be done from the Edit command of the change order or from the Edit Properties dialog.
For more about editing change order properties, see Working with Properties.
You can define properties in addition to the default properties (Change Order Number, Change Order Title, and Description, and so on). An administrator must configure additional properties before they can be used.

Administration
Vault Settings. 
If you want this property to be associated with other entity classes, select them from the Associations list.
This is a special property that shows the state of items associated with change orders. The state is shown in the main Change Order List pane and has three possible settings:
Checked - Associated items are in Review, Released, or Obsolete states.
Unchecked - Associated items are in Work in Progress state or there are no associated items.
Undetermined - Change order closed or cancelled 