Checkpoint 3000 Multiple Public IP Ranges

[bradrmorris]

We are in the process of migrating off our existing firewalls to a Checkpoint XL Cluster.  We currently have 2 different Public IP Ranges from our ISP.  The interfaces of our existing firewall are assigned IPs from one ranges (range 1) as well as having other manual NAT Rules for IPs in this range.  We then have NAT Rules for IPs in the other range (range 2) that work even though we don't have any physical interfaces with IPs in this range. 

So far on the checkpoints I am only able to get NAT rules working for one IP Range which is the same range we are using on the Interfaces.  Is there a way to get our Second IP Range working without having to assign IP From that range to an interface?