RouterBOARD RB2011iL-IN Priority on Ports

Hi!

How can I manage this?

Port 1-5 are going over an VPN connection and they should have priority.
Port 6-9 should be routed through the WAN Port directly (not through the VPN), the speed/priority should be auto decreased on Port 1-5 activity
Port 10 ist the WAN-Uplink


Many thanks in advance!