Setting the default Traffic-Group

We have 2 F5 boxes in a cluster environment. There are 2 traffic groups configured in it and I would like to set traffic-group-2 (floating) as the default group for new objects. Presently, any object created is getting assigned to traffic-group-1(floating) and manual efforts are required to move it to group-2. Any idea how to set the default traffic-group to group-2?