Groups are used to organize different types of resources based on common attributes (such as their department or location within your organization) and set the same restrictions or permissions across the members of the group. Users, Assets, Job titles, and Asset Types can become members of the group and share the same settings:
A Group can also be used in a different context to satisfy different business cases. For example, a User gets Billing rates from a specific Rates Group organized by function, but their capacity will be managed as part of a different resourcing group determined by geography.