The analytics integration options can be found in the “Integrations” tab on the Home page with some of the most popular tools for integrations. Google Analytics (GA) can be enabled by toggling the Off button to On. You can integrate for either Google Universal or Classic Analytics. For both, you can select a dimension/slot number and a custom tracker.
You can choose a new dimension number in Universal Analytics case or a new slot number in Classic Analytics case that is not being used in any other experiment or any other custom variables in your current Google Analytics. Additionally, you can use custom tracker field if you have defined a custom tracker on your page.