You can delete all existing instances of a portal on all hosts and clean up the portal's data in the Access Manager LDAP directory.
Login to the Portal Server Management Console.
Select the Portals tab.
From the list of portals, select the portal you want to remove, and click the Delete Portal button.
For more information on the psadmin delete-portal subcommand, refer the psadmin delete-portal in Sun Java System Portal Server 7.2 Command-Line Reference section in the Sun Java System Portal Server 7.2 Command-Line Reference guide.