Start the Administration Server of the web container.
Create a new web container instance.
Start the web container instance that you have just created.
Login to the Portal Server Management Console.
Select the Portals tab.
Select the name of a Portal Server.
Select the Server Instances tab.
Click on the New Instance button to launch the wizard.
Provide the name of the portal identifier.
(Optional) Change the default web container instance properties.
For information, see Creating a Portal Instance on the Same Node section in the Sun Java System Portal Server 7.2 Installation and Configuration Guide.
Verify the information you supplied, and click Finish to create the new portal instance.
A progress bar displays the status of this procedure. When the procedure is complete, a results page is provided.
Click Finish to create your new portal instance.
psadmin create-instance in Sun Java System Portal Server 7.2 Command-Line Reference