How do I set up 2 or more focboxes over can bus?

I have been building boards for a while now and just upgraded to 4 torque board direct drive motors and 2 foxbox vesc’s. I can get both vesc’s to work independently but when I try to combine them over canbus only 1 vesc operates at a time. It is hard to get info on this topic, everyone makes it seem like they already know abou canbus. There’s 4 wires and some can bus cables have only 2, there’s positive, negative, Can H and Can L. It’s Can H to Can H and Can L to Can L or do they swap?

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