The turn signal lever fell off, is there a way to reattach it w/o removing strng on 1993 Pontiac Bonneville

Is there a way to fix the indicator lever without removing the steering wheel?

Not really and to remove the steering you have to disable the air bag first. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate