I’m using “Ultimate Post Type Manager” (http://ww.wp.xz.cn/plugins/ultimate-post-type-manager/) for creating the custom types:
directorio (Directory)
dire_pais (Country)
dire_estado (State)
dire_municipio (City)
dire_pais, dire_estado and dire_municipio custom types are related to “directorio” using related custom fields created with “Advanced Custom Fields” plugin (http://ww.wp.xz.cn/plugins/advanced-custom-fields/)
The custom fields are:
meta_key name: pais, type: relation, post_type: dire_pais
meta_key name: estado, type: relation, post_type: dire_estado
meta_key name: municipio, type: relation, post_type: dire_municipio
I have one custom type “Directory” and it has “Country”, “State”, “City” and others dropdown custom types related
