I\'m moving my configuration from using web.config transforms to being based on VSTS variables. I get process variables, you define a variable, pick an environment, and you
This has now been implemented in VSTS variable groups as scopes. Go to your release definition -> Variables -> Variable Groups -> Link variable group, and you get the link window as below, where you can choose the scope to be either release or one or more of your environments!
I did not manage to find any release information on this feature, I just stumbled upon it as I was tweaking my releases.