Administrators create hubs in which data and projects are stored. Normally, as an administrator, you do this right after purchasing Fusion licenses for your team members, then you invite them to the hub. This is described in Get started for administrators. You can only create one hub.
However, there may be times when you want to create and administer additional hubs; for example, for a large organization with multiple groups working in separate, unrelated areas. To do this, follow these steps.
Choose someone from the hub you have already created, and make that person a hub administrator.
See Administer hub members and roles.
Have the new administrator follow the hub creation steps in Create a hub (new administrator).
Have the administrator invite you to the hub and make you an administrator, as described in in Administer hub members and roles.
Now you can administer the hub and invite other people to it.