Place roast in slow cooker. Add water, beef broth, and seasonings.
Cover, and cook on low for 8-10 hours, or on High for 4-5 hours. When done remove bay leaf, and shred meat with a fork. Cover to keep warm.
In a large skillet with olive oil saute onion, mushrooms, and sweet peppers until tender.
Cut your hoagie rolls in half length wise, making sure not to cut through the back of the bun. Brush with olive oil and sprinkle with garlic salt. Place on a baking sheet. Bake in a 350 degree oven until lightly toasted.
Remove buns from oven. Add provolone cheese to both halves of the bun. Replace in oven and bake until cheese is melted and bubbly.
Remove hoagie rolls from the oven. Using tongs, grab a healthy serving of the Italian cooked beef allowing it to slightly drain.
Place beef on the bun, top with sauteed veggies and serve with beef broth for dipping.