The goal is to have the Dev and Live env from Google Tag Manager map to Dev and Live environments on Universal Analytics.
About UA, from what I know, it doesn't have environments, so I would just create two properties, under Admin, each representing an environment.
Now, I've got to a point where I create the environments in Google Tag Manger. How do I proceed from here in order to link them to the appropriate UA properties?
If I'm taking a wrong approach, please steer me away.
Found my answer in this article.
In short:
Environment Name
Built-In Variable