Place beef, broth, soy sauce, garlic, and ½ of the peppers and ½ the onions in the slow cooker.
Cook on low about 8 hours.
Use 2 forks to shred the beef in to tiny pieces. Remove any fat particles/pieces that you see.
Add remaining onions and peppers and cook for another hour.
Preheat oven to 350.
Open sub/hoagie rolls and place provolone on each side and heat until cheese is melted and bread is slightly crunchy.
Use a slotted spoon to scoop up some of the meat mixture (letting the juices drain as much as possible)
Top the bread & cheese with the meat mixture and serve!