gnus: Category Buffer

 
 6.9.2.2 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’).
 
 ‘e’
      Use a customization buffer to set all of the selected category’s
      parameters at one time (‘gnus-category-customize-category’).
 
 ‘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’).