VMS Help MERGE, Specification File Qualifiers, /CDD_PATH_NAME, Full Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    /CDD_PATH_NAME can be used in place of or in conjunction with
    /FIELD statements. The /CDD_PATH_NAME qualifier identifies
    CDD/Plus defined fields and attributes for SORT. Identifying
    these fields with this qualifier is the same as specifying them
    with the /FIELD qualifier.