Open any contact, switch to the All Fields page, and under User-defined Fields in Folder, delete the ones you don't want.

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Sue Mosher, Outlook MVP
Author of Microsoft Outlook 2007 Programming:
Jumpstart for Power Users and Administrators
http://www.outlookcode.com/article.aspx?id=54
> In a Public Folder for Contacts
>
>> In what kind of folder?
>> > Is there a way to clear out/delete some of the "User Defined Fields" from
>> > Outlook 2003?
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>> >
>> > Thanks a million!