VMS Help SCA, CREATE, LIBRARY, Qualifiers, /BEFORE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /BEFORE=library-spec

    Instructs SCA to insert the new library or libraries into the list
    of active SCA libraries in front of the library you specify as the
    value of the qualifier. If you do not specify a value, SCA adds
    the library or libraries to the beginning of the list.