Hi Issac !
To run a subfolder of your collection using the Newman CLI, all you would need to do is specify its’ name after the folder tag.
E.g. I have a subfolder in my Airtable API Collection called Types Table. To run only this subfolder, I’ll use the following command:
newman run Airtable\ API.postman_collection.json --folder "Types Table"
Btw, @danny-dainton answered a similar question in greater detail here!