Eliminating carbs goes a long way to slimming your belly. There is a reason why people call a protruding stomach a beer belly. Regular aerobic activity will also help to trim that problematic area. Exercising your core will tighten the muscles to give you that sculpted look. It is important, however that you train in a proper way. One way to learn proper form for core muscles is to take a pilates class from a certified instructor.
Exercising abdominal muscles improperly can give you a poor result. Maintaining good posture goes a long way toward helping you strengthen your abs. The quality of your exercise is more important than the quantity. Keep plugging away!!!