Do Arc Fault Breakers need to have a dedicated neutral in oder to work?

Yes, you wire just like GFI's. If bedroom was having ARC fault installed in older house. You may need to pull a neutral to where a multicircuit seperates(if 2 circuits are sharing the same neutral) So the neutral load is separate for that circuit only, not a circuit sharing that neutral.

Yes, you wire just like GFI's. If bedroom was having ARC fault installed in older house. You may need to pull a neutral to where a multicircuit seperates(if 2 circuits are sharing the same neutral) So the neutral load is seperate for that circuit only, not a circuit sharing that neutral.

Thank for the answer!:)