The manual has:

>3.3. Defining search categories in a list header for the CataList
>=================================================================
>
>Note: The  complete list of  search categories  may not yet  be available
>when LISTSERV 1.8c  is released. Note also that during  the "pilot" phase
>of categories implementation, all categories  will be "open", and you can
>define search  categories for  your list  as long  as the  categories you
>define are in compliance with the rules for defining categories. When the
>"production" phase begins,  only categories defined below  as "open" will
>be open,  and if a  list is created  or modified without  a "Categories="
>keyword, LISTSERV will  issue a warning (but will go  ahead and store the
>list without it).

It then goes on to explain how to add a sub-category. But as far as I can
tell *none* of the categories are open (based on a GET LISTCAT FILE), and
no sub-categories can be added, and much of this section is irrelevant.

Am I missing something?

Don.