How do i add a static route in LEM 6.0

Hey guys;

can someone tell me how to add a static route in LEM 6.0.  For security reasons 1 run 2 firewalls, one is my default gateway which handles 95% of my servers and one is my backend firewall that handles 5% of my servers, since i can only have one default gateway i need to add a static route.  I have tried ip route add but it says command not found.

thanks