The Category Buffer
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You'd normally do all category maintenance from the category buffer.
When you enter it for the first time (with the `J c' command from the
group buffer), you'll only see the `default' category.
The following commands are available in this buffer:
`q'
Return to the group buffer (`gnus-category-exit').
`k'
Kill the current category (`gnus-category-kill').
`c'
Copy the current category (`gnus-category-copy').
`a'
Add a new category (`gnus-category-add').
`p'
Edit the predicate of the current category
(`gnus-category-edit-predicate').
`g'
Edit the list of groups belonging to the current category
(`gnus-category-edit-groups').
`s'
Edit the download score rule of the current category
(`gnus-category-edit-score').
`l'
List all the categories (`gnus-category-list').