Add an appearance by duplicating an appearance and modifying the properties.
Material and Appearance panel
Appearance
. The Appearance Browser displays.
Material and Appearance panel
Appearance
. The Appearance Browser displays.
. The appearance is added to the document, and opens for editing.
, and then click Duplicate Appearance. An appearance is created using the selected appearance. New appearances have the same name as the appearance they were created from, with a number appended.