I'd like to know if I can configure a Zone accross 2 VR? Which means I have 2 interfaces in Trust Zone, 2 interfaces in Untrust Zone but interfaces in the same Zone belong to different VR.
No you cannot add one security zone i 2 VRs.
SO if you have 2 interfaces in one security zone then you need to add both the interface into the same VR.
You cannot add 1 interface into 1 vr and the second interface into another VR.