FYI, the test servers allow editing of any of the Concerto bib records to add 856 fields with second indicators for testing purposes. For example, I copied some unrelated 856 fields out of an unrelated record on our production server and added them to 'Blueberry girl' (TCN 216) on both of the terran & tiffany test servers. I can see that a new Electronic resources section now appears under the holdings in the OPAC, but I don't know enough cataloging to test it further than that.
FYI, the test servers allow editing of any of the Concerto bib records to add 856 fields with second indicators for testing purposes. For example, I copied some unrelated 856 fields out of an unrelated record on our production server and added them to 'Blueberry girl' (TCN 216) on both of the terran & tiffany test servers. I can see that a new Electronic resources section now appears under the holdings in the OPAC, but I don't know enough cataloging to test it further than that.