If you're asking about pinning specific traffic to a given ISP link, then sk56384 might help. Otherwise, if you want traffic to specific hosts/networks to egress out a specific ISP link, then classic static-routes will be used here. Hopefully you don't need to resort to PBR, but if so, then sk167135 could be used to apply a security policy (in SmartConsole) to PBR rules.
There are tons of limitations and restrictions with PBR, so read sk167135 VERY VERY carefully. You should also be warned about PBR, which @PhoneBoy told me long ago: Once your routing decisions go into PBR, then EVERYTHING stays in PBR. Depending on your use-case, you may need to have a near-100% duplicate of your global routing domain inside your PBR domain. #TreadCarefully #HereThereBeDragons