This support ticket is created hace 6 años, 1 mes. There's a good chance that you are reading advice that it now obsolete.
This is the technical support forum for Toolset - a suite of plugins for developing WordPress sites without writing PHP.
Everyone can read this forum, but only Toolset clients can post in it. Toolset support works 6 days per week, 19 hours per day.
Hoy no hay técnicos de soporte disponibles en el foro Juego de herramientas. Siéntase libre de enviar sus tiques y les daremos trámite tan pronto como estemos disponibles en línea. Gracias por su comprensión.
Where does your cpt/maintaxonomy/listing-name URL structure come from?
Taxonomies don't appear in URLs for posts (which is what I assume you mean by listing-name). With standard posts you can add %category% in the permalink structure, but not with custom post types and taxonomies, for which you need a custom rewrite solution.
So, before going any further in looking into how to make this work with sub-categories, can you describe your current solution?