Outlook doesn't provide a way to do that.

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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> Outlook
> Entering new contacts....how can I add to the drop down title and suffix
> lists under "full name". Example of items to add "Mr. & Mrs." under title
> and "Esq" under suffix