[itsm] Service query

Hi, I created a service 'Email System'. Then I created the following services as sub services 'anti spam', 'anti virus', 'calendars', 'mailboxes', 'blackberry gateway', webmail. When I go to create a ticket, phone or email, the Server drop down is empty. Is this normal ? Also, I created an SLA, but can't see how I link SLAs to Services. Is there a way ? Are services automatically dependant on sub services ? Thanks Matthew Joyce 02 9382 0051 | IT Manager | Children's Cancer Institute Australia for Medical Research