neuter

  DIRSTRUCT/NEUTER - disable directory without removing data 

  DS = NEUTER(DS, DIR_OR_LIST)

  Given a directory or a list of directories that reside inside the path
  of the DIRSTRUCT object, NEUTER moves the file 'reference.txt' to be named
  'reference0.txt', and re-searches the catalog of DS. This change means
  that the directory (or list of directories) will not be found among the
  test directories of DS.