Add more than one “Link Posts” field per CPT. Use additional links to define relationships. Want to add 16 links to “Places”? With the click of a button you can!
Requires GeoDirectory Custom Post Types adddon.
Once installed, visit any post and add the GeoDirectory Link Posts field for your first link.
Next, check under that for the new Additional Link Posts field. Add as many as you like to each CPT.
Supported usage in GD > Linked Posts and GD > Post Meta for display.