Change the Contacts Folder View to by Category. Right click and drag the
Category required to a newly created Contacts subfolder then choose Copy.
Make sure the new subfolder has been enabled as an email address book by
right clicking on it and choosing Properties > Outlook Address Book Tab >
and check the box to enable as email address book. Create your new
Distribution List and make sure the Show Names drop down field points to
this new subfolder then shift select all the contacts and voila.
