SOS in configuring a firewall

I am configuring a firewall in Windows Server 2008. I need to add multiple subnets to an inbound rule but it is making me add the subnets one at a time. Is there any way to add multiple subnets at the same time?
I tried separating them with commas and adding them via the GUI but it would not take it. Also if you have already input a long list on subnets on one firewall rule, is it possible to copy it over to another firewall rule?
