org: Multiple sets in one file

 
 5.2.3 Multiple keyword sets in one file
 ---------------------------------------
 
 Sometimes you may want to use different sets of TODO keywords in
 parallel.  For example, you may want to have the basic ‘TODO’/‘DONE’,
 but also a workflow for bug fixing, and a separate state indicating that
 an item has been canceled (so it is not DONE, but also does not require
 action).  Your setup would then look like this:
 
      (setq org-todo-keywords
            '((sequence "TODO" "|" "DONE")
              (sequence "REPORT" "BUG" "KNOWNCAUSE" "|" "FIXED")
              (sequence "|" "CANCELED")))
 
    The keywords should all be different, this helps Org mode to keep
 track of which subsequence should be used for a given entry.  In this
 setup, ‘C-c C-t’ only operates within a subsequence, so it switches from
 ‘DONE’ to (nothing) to ‘TODO’, and from ‘FIXED’ to (nothing) to
 ‘REPORT’.  Therefore you need a mechanism to initially select the
 correct sequence.  Besides the obvious ways like typing a keyword or
 using completion, you may also apply the following commands:
 
 ‘C-u C-u C-c C-t’
 ‘C-S-<right>’
 ‘C-S-<left>’
      These keys jump from one TODO subset to the next.  In the above
      example, ‘C-u C-u C-c C-t’ or ‘C-S-<right>’ would jump from ‘TODO’
      or ‘DONE’ to ‘REPORT’, and any of the words in the second row to
      ‘CANCELED’.  Note that the ‘C-S-’ key binding conflict with
      ‘shift-selection-mode’ (SeeConflicts).
 ‘S-<right>’
 ‘S-<left>’
      ‘S-<<left>>’ and ‘S-<<right>>’ and walk through _all_ keywords from
      all sets, so for example ‘S-<<right>>’ would switch from ‘DONE’ to
      ‘REPORT’ in the example above.  See also SeeConflicts, for a
      discussion of the interaction with ‘shift-selection-mode’.