Here is my scenario:

We have three departments currently.  A call center, a Managed services department, and an Infrastructure team.

Currently we have SDP MSP set up with the Managed services accounts and the infrastructure teams accounts.  I can set all of the managed services accounts to "refer default settings" so that all my business rules, support groups, and other settings are all easily changeable.

The call center is using SDP and has 14,000+ requesters.  We need to migrate all of the requesters (+  create accounts) into our SDP MSP.

After the migration, I don't want to see all of their tickets mixed in with mine. 

Is there a way to have multiple departments where I can put accounts and then make changes to the departments (such as business rules, support groups, etc) so that I can click into a department, make a change, and have it propagate for the call centers 1000's of accounts?

Departments doesn't seem to do what I want, but I'm also oblivious to the obvious.