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Unfortunately, GA4 does not currently offer a built-in function to help differentiate between internal and external traffic without completely filtering out either one. However, you have the right idea by thinking of adding a parameter to identify the traffic type through Google Tag Manager. This is a common and widely used solution for this issue. You can create a custom dimension and use it to label your internal traffic; then, you can apply it as a filter in GA4 whenever you want to see data specific to it. It’s going to require some setup, but it is the best way forward given GA4’s current configuration options for internal and external traffic.
