Windows 2003 NIC Firewall Settings - How to add port ranges

I have a question regarding the Windows 2003 firewall settings. When I click
on the Exceptions tab, I see a list of some of the services. When I click on
File and Print Sharing and select Edit, I get a list of tcp & udp ports for
this service. How can I create a new service item and add multiple ports
under that item (just like File & Print Sharing)? Right now I click Add Port,
give it a name and specify the port number. When I have to allow a port
range, or multiple ports that aren't in the same range, I create a new port

Thanks in advance for any help given.