I don't think you can even just make one FP+ - you have to make 3 and they all need to be in the same park.
Once done you can go to another park and make one at a time. I believe some CM's will make a FP+ booking for you for another park while still in the 'current' one.
This is something I really thought they would fix eventually back when everyone was bashing FP. Now that the hate has worn down, I'm worried they aren't going to continue to improve the system. Everyone got so excited about the 4th FP, but honestly it's worthless. I'm fine with keeping tiers at EP/HS but let me book at different parks.
You can only make 3 in the same park ahead of time. After those have been used or have expired, you can go to a different park and make another FP while in the park. Once you use that one you can make another. Subject to availability at the second park.
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