AT Internet natively distinguishes natural sources (direct access, referrer site, webmail, etc.) and marketing sources that correspond to the traffic generated by campaigns (emailing, advertising, etc.)
On top of the default natural sources, you can create your own custom organic sources (up to 5 different sources). These custom sources are composed of families, themselves composed of rules defined on the basis of the characters composing the referrer domain.
Custom Organic Sources can be configured from the Settings menu, providing that your account has the right level of access.