You need to use the same command as when configuring a Cico router to route packets, ie: route ….
<a href=”http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a008019e74e.shtml”>This paper</a> will teach you how to configure Inter VLAN routing in a Cisco layer 3 switch.
Nate that if this is you’re first time configuring this kind of things, you might want to let a Network Professional configure what you want…
Go into Global Config
Switch# Conf t
Turn on IP routing
Switch(config)# ip routing