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Place the Italian sausage links, spaghetti sauce, green pepper and onion into a slow cooker. Stir to coat everything in sauce. Cover, and cook on Low for 6 hours. Serve on hoagie rolls.
Saute the onion, garlic, and green pepper in olive oil. Add the sliced Italian sausage and sautÃ© until it is completely cooked. Add the oregano, parsley, basil, salt, and white pepper, and simmer for 3-4 minutes. Add the tomato puree, tomato paste, diced tomatoes, and sugar. Bring the sauce to a simmer.