VMS Help NCS Command, Command Qualifiers, /DELETE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  /DELETE=collating-sequence-name[,...]
  /DELETE=conversion-function-name[,...]

   Use this qualifier to delete the specified definition file  from  the
   NCS library.  If  you  specify  several  definitions,  separate  the
   definition names with commas, and enclose the list in parentheses.