The Extended Data tab of the Properties palette contains the following object properties:
Hyperlink: You can add a hyperlink to an object.
Text Notes and Reference Files: You can add a note or an associated reference file to an object.
Property Sets: You can add, edit, and remove property set data for an object.
Note: The listing of the properties set definition in the Extended Data tab can be controlled using the Properties Override drop-down options in AEC Object setting tab in the Options dialog box.
Property Sets From Style: You can add, edit, and remove property set data for the object style.
Detail Component Data: You can add, edit, and remove detail component data for an object.