RHN
Unregister RHEL 7 using Subscription Manager and Remove System Profile
Unregister RHEL 7 from Red Hat Network using subscription manager and remove system profile. subscription-manager unregister, clean to remove subscription data
Register RHEL 7 host to RHN using subscription manager (with or without proxy)
Register RHEL 7 system to Red Hat Satellite Network using subscription manager. Attach pool, enable and disable repositories with or without proxy in RHSM.conf