The  FMS/LIBRARY/DELETE  command  removes  the  specified form from a
  form  library. Use the /FORM_NAME qualifier to specify the form to be
  deleted.  The default input file type is FLB. There is no output. (To
  delete the entire library use the the DCL DELETE verb.)

  Example:

      FMS/LIBRARY/DELETE LIBNAME/FORM_NAME=(FORM1,FORM2,FORM3)/LOG

      The  forms  FORM1,  FORM2  and  FORM3  are  deleted  from  the
      library  LIBNAME  and  a  log  of  the  operation is output to
      the device SYS$OUTPUT.