You will need to register the system by using either updatemanager (GUI) or sconadm (CLI).
For registering with updatemanager see the following URL:
http://docs.sun.com/source/835-0615/Registering.html
And for sconadm:
http://sunsolve.sun.com/search/document.do?assetkey=1-9-82688-1
Note that the systems will need to be connected to the Internet (either directly, or via a proxy) in order to register them and to manage them via the online portal.