Permalinks: custom post type -> custom taxonomy -> custom sub taxonomy -> post
you can try with this plugin (or see its code) https://wordpress.org/plugins/wp-better-permalinks/ It allows you change the custom friendly permalinks structure to Custom Post Type > Taxonomy > Post and Custom Post Type > Taxonomy instead of default WordPress structure. it Provides different permalinks structure pattern: Custom Post Type > Single Term (or Term tree) > … Read more