Select from the tabbed choices at the top of the Attributes menu:
Predefined Attributes
Column Name: Specify what attribute name to show on the playlist.
Attribute: All attributes in this column are used in Page Content Filling Dialog, Rules condition and Filtering Options.
Editable: If value can be edited when shown in the Playlist menu.
Metadata Attributes
Selecting the tab Metadata Attributes reveals more selections:
Attribute Type: In what kind of events this attribute is found.
Get metadata from playlists triggers the client to examine all playlists in the channel and
Find all attributes in primary and secondary events.
Automatically adds all attributes in the Playlist Data Mapping table with Column Name blank.
To show playlist metadata in the Playlist column
Right-click on playlist column > Use External Data and specify a Column Name.