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A Red Hat training course is available for Red Hat Enterprise Linux Removing Subscriptions from the Command Line

A system can be attached to multiple subscriptions and products. Similarly, a single subscription or all subscriptions can be removed from the system.
Running the unsubscribe command with the --all option removes every product subscription and subscription pool that is currently attached to the system.
[root@server1 ~]# subscription-manager unsubscribe --all
It is also possible to remove a single product subscription. Each product has an identifying X.509 certificate installed with it. The product subscription to remove is identified in the unsubscribe command by referencing the ID number of that X.509 certificate.
  1. Get the serial number for the product certificate, if you are removing a single product subscription. The serial number can be obtained from the subscription#.pem file (for example, 392729555585697907.pem) or by using the list command. For example:
    [root@server1 ~]# subscription-manager list --consumed
        Consumed Product Subscriptions
    ProductName:         High availability (cluster suite)
    ContractNumber:      0
    SerialNumber:        11287514358600162
    Active:              True
    Begins:              2010-09-18
    Expires:             2011-11-18
  2. Run the subscription-manager tool with the --serial option to specify the certificate.
    [root@server1 ~]# subscription-manager unsubscribe --serial=11287514358600162