How do I specify the environment in a custom configuration file?

I'm trying to create a custom configuration file for a constant. I've looked at the appian documentation which provides an example. However, it does not explain how to specify what value goes for each environment. Is that possible, or is the value in the config file only for that environment. So if I have different value for dev, test and prod, do I need to create different custom config files for each environment?

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