Is it possible to use one QU 32 to control another? Basically, it’s an outdoor setup and it would be more convenient to keep everything inside in the building behind the stage. I guess like a d-snake situation but with another board instead of a remote audio rack.
In short, no.
There are ways to create setups using MIDI between systems to have one make changes to the other, but these are not really practical.
The best options here would be to use remote audio racks/boxes (AR2412, AR84 or AB168) or to simply use an iPad running Qu-Pad for full remote, wireless control.