Hi Anh, I guess I didn't ask the right question. I want to add a new field to a custom taxonomy so they are connected rather than creating two separate taxonomies. I think I found a way to do this, by creating a custom taxonomy, then creating a custom field group that shows for the taxonomy and the custom field I want associated with the tax.
https://imgur.com/SoJHbZn
https://imgur.com/6jzKoar
Does this look right?