To add an attribute to a repository, you must edit the repository’s profile:
On the Feature bar, in the Content tab, open the repository’s folder.
Click the arrow to the right of the repository you want to add a new attribute to, click the Manage Model submenu, and select Profile. The Profile Editor will open.
Click the Next button to move to the list of attributes.
In the Action dropdown menu, select New.
A new attribute will appear. Edit the configuration settings as desired. For information about the attribute settings, see Profile Attribute Configuration Fields.
When you are finished editing the Attribute, click the OK button.
In order for your changes to the Profile to be saved, you must click the Save button on the Profile editor before exiting.