Place beef, beef base, carrots, celery, garlic, onion, pepper, kidney beans, tomatoes and gravy in order listed in 3 1/2- to 4-quart slow cooker. Cover and cook on low heat setting 10 to 12 hours. Stir in Italian seasoning, sugar and frozen green beans. Increase heat setting to high. Cover and cook 15 minutes or until green beans are tender.