http://rw-rw.facebookwkhpilnemxj7asaniu7vnjjbiltxjqhye3mhbshg7kx5tfyd.onion/business/help/186167430864991
To find it, refer to this article from Google’s Analytics help center. The ability to set up a custom dimension to distinguish between shop and website activity. To set one up in Google Analytics 4 : Add a custom dimension. Choose a dimension name and description.