[Koha] Subtitles

Could some kind person please help with subtitles MARC 245$b in mysql reports? We're trying to improve a fully functional script, but for a SELECT neither [other things],biblio.subtitle AS Subtitle,[other things] nor [other things],biblio.remainderoftitle AS Subtitle,[other things] appears to function (the second comes from the Koha Wiki which suggests that it was introduced in/after 3.2 having been dropped in v3.) The "SchemaSpy" also appears to be silent on this field. Many thanks - Paul