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

    /MACRO=filespec | "macro", . . .

    Directs MMS to add to or override the macro definitions in the
    description file. This qualifier affects the behavior of MMS but
    not the execution of action lines.

    The filespec is an OpenVMS file specification or a logical name
    that identifies a file of macro definitions. The default file
    type is .MMS. The macro string is a macro definition enclosed
    in quotation marks. The definition of the macro should always
    assign a value to the macro. Use the same format as for macro
    definitions in description files, that is, name = "string".

    With the /MACRO qualifier, you can specify a macro definition
    on the MMS command line. You can also specify a file
    of macro definitions to use in your description file.

    You can define macros in three locations:

    o  In a description file

    o  In a macro definitions file

    o  On the command line

    To specify more than one macro definition on the MMS command
    line, enclose the list of macros in parentheses. For example:

    $ MMS/MACRO=("A=MAC1", "B=MAC2")

    You can also specify both a macro definition and a file on the
    same command line. For example:

    $ MMS/MACRO=("A=MAC1", MACROS)