Outlook does not support importing to a custom form, nor importing custom fields. You would need to write your own import code or use a third-party tool. See http://www.outlookcode.com/article.aspx?id=23

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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
> Can you import data to new 'user defined' fields in your Outlook contact
> list? I created a couple of new fields but the import function will not allow
> me to map to them.
allenj - 28 Dec 2007 19:24 GMT
Thanks for the quick response Sue.
> Outlook does not support importing to a custom form, nor importing custom fields. You would need to write your own import code or use a third-party tool. See http://www.outlookcode.com/article.aspx?id=23
>
> > Can you import data to new 'user defined' fields in your Outlook contact
> > list? I created a couple of new fields but the import function will not allow
> > me to map to them.