Trading Groups Overview
Trading Groups allow organizations to share setups across accounts. In particular, a Trading Group consists of exchange order entry session information and back office clearing synchronization configuration (e.g., GMI syncing). All accounts that belong to a Trading Group share the same session and synchronization setups. An account can be assigned to only one Trading Group at a time.
A Trading Group's resources can also be shared with other organizations. For example, an external organization can be given permission to trade with the order entry sessions defined in a Trading Group. This can be useful when an FCM manages these resources but allows a partner IB to access them, for example. Account management responsibilities can also be shared between organizations.
More details can be found here: