One out of five sectors is very weak in sales and distribution, due to marketing and lack of desire , what should the sales & distribution manager to do ?

need more play the marketing , and  make plan for sales so need follow from management 

They need to know the information on company history. Its policy ,rules and regulations etc.

Details about the product : Its features, Usage, Demand . Maintain product quality.analyzing the competition . research on customer demand. Development of objectives . Find out the the reason of  lackness .