/sys$common/syshlp/helplib.hlb CMS, COPY, CLASS, Command Parameters  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 old-class-expression

    Specifies one or more existing classes to be copied. If you
    specify more than one class to be copied, you must use a
    wildcard character for the new class name. An old class
    expression can be a class name, a wildcard expression, or a
    list of these separated by commas.

 new-class-name

    Specifies the name for the new class. The name cannot be the
    same as any existing class name in the target library. Wildcards
    are allowed. If you specify more than one class with COPY CLASS,
    you must use a wildcard character for the new class name.

 remark

    Specifies a character string for the creation remark of the new
    class to be logged in the history file with this command. The
    remark is enclosed in quotation marks. If no remark was entered,
    then the remark from the old class is used for the creation
    remark of the new class, but a null remark ("") is logged in
    the history file.