Is it possible to nest hierarchical post types in the admin

Is it possible to nest hierarchical post types in the admin bar. See attached image.

I'm going to have a separate CustomPress post-type for different animal/pet species, such as Dog/Cat/Horse/etc (i have to do this, as each one has different custom fields). It would be nice for our editors, if this could be collapsed into a single admin menu item based on the parent/child relationships.

Alternatively, if there is an easy way to define custom field selection based on taxonomies/etc, that would work as well.