You can use either the Delegated Administrator Console or Utility:
Delegated Administrator Console
In the Delegated Administrator Console, use the Create New Resource wizard. (Click New in the Calendar Resources tab for the organization where the resource is to reside.) For more information, see the Delegated Administrator Console online help.
Delegated Administrator Utility
User the commadmin utility rescource create command to create an LDAP entry. For example, to add the conference room Conference_Room_100, use the following command:
commadmin resource create -D calmaster -w calmasterpassword -n sesta.com -c room100 -N Conference_Room_100
You must then use csresource to create the actual resource calendar. For information on how to create a resource calendar, see Creating Calendars
For details on all the available options for the commadmin utility, refer to the Sun Java System Communications Services 6 2005Q4 Delegated Administrator Guide