This is why the Add new custom post type page is divided into two columns. On your left, you have the form you need to fill to create your custom post type. On your right, you have a form to create a custom taxonomy if you need one. This is why the Add new custom post type page is divided into two columns. On your left, you have the form you need to fill to create your custom post type. On your right, you have a form to create a custom taxonomy if you need one.