FAB and Selling The Price For Dr. Sherif M. Morsy Authorized and Certified Trainer have about 10 years of training experience in sales and marketing fields beside 7 years of experience in many pharmaceutical and medical devices companies between multinational and international sectors . Feature Advantage Benefit . What is the difference from a sales point of view and the advantage and disadvantage of the selling the price also the after sales services provided percentage from a marketing point of view