I was trying to drop the rear subframe to replace the bushings with poly aND with little effort, snapped the rear left stud. The other end looks like it leads to the frame rail. Does anyone have any idea how to fix this? My initial thought is drill it out and weld in a new stud, but is there an easier way? If this is in the wrong section I apologize.

 

Were you using an impact wrench? Those studs are welded to the frame so that is probably your only option.

 

these are not replaceable, they are part of the frame.
You can take it to the shop and have them weld on a threaded part from any other bolt. That would be your cheapest option aside from cutting into the frame rail and welding in a new piece of it with a non broken stud