Google Analytics has introduced a new feature that allows users to build personalized channel groups, either by starting from scratch or by utilizing Google’s default channel group as a foundation. About custom channel groups. Custom channel groups can be utilized in reports that already support default channel groups as a primary dimension, such as Acquisition reports. Additionally, custom channel groups serve as dimensions in custom reports, explorations, and when constructing conditions for audience segments. To learn more about custom channel groups, including opening and creating them, you can review the Google help doc here.