I am building a custom menu section (a new item with subitems in the main menu section on the left side) in the WordPress Administration of my website. The section shall include a main post type, and for this you should be able to link category and country.
It would be possible to use taxonomies, but taxonomy only supports multiple choices. Therefore, I want to be able to create new post types for category and country instead of taxonomies.
But it won't work out if I want it to be under the same menu section? Please help.