Hi Amit,
On further clarification, CPM team structure is independent entity within CPM. Team in CPM is used by managers to notify, assign responsibilities (w.r.t objects like WBS, NWA, issue, change request and so on), quick contact, quick mail, for approval (like in issue and change request) and so on.
Added feature is that CPM pulls the resources from HR master and from other sources. You can find different option available while assigning team members.
Let me know if you need further information.
Regards,
Pradeep