You can create multiple organizations for business groups, which are independent of each other.
Enter Organizations-> Users-> User Organizations page, you can create, edit, as well as delete organization.
After organization is created, you may create department. Still on this tab, select the organization you'd like to create, then click Department and click Create Department.
The created organizations or departments can be edited or deleted. Changing the site and email address, moving departments and users to other departments or organizations are also supported.