Exactly
You can't have two devices on one one zone or point , each device has to have its own zone or point
If you mean can you have a wireless PIR on a wired zone like zone 1 onboard it can be wireless instead
Yes you can turn them off, but that you can do with part set A or B or even setting zones up on blocks if you have other uses
Just add all your devices and those pirs you want to exclude on part set a just select that option in each point or zone and it won't arm on part set