Sharepoint List Managed Metadata - multiple values tagged to List/Document Library?

Hey all!

I'm new to working with Managed Metadata and I have a Sharepoint List with links to files within a Document Library. (All within the same Sharepoint site)

I'd like to tag both the Sharepoint List records and the Document Library files with my metadata, for fine-tuned searching, and to have some tags to 'hook' to in my PowerApp.

I have a Term Group set called WRCounties, with Level 1 Terms that are the US States, with that state's counties available as Level 2 Terms.  I'm hoping that's the correct way to go about that.

It seems like I can only add a single tag per Sharepoint record by adding a column. I'd like to have multiple counties tagged to each Sharepoint record. Creating a new column allows me to toggle "Multiple items supported", but it seems like I can still only tag one at a time. 

Am I missing something? Thanks in advance!