310191 Purchase and sales inventory

My company imports filters,oil,grease,and some other items. we buy this from different suppliers and sell in local market. I want sepreate account for my each supplier how much we have to pay them how much is balance. i want sales details according to invoice and if the invoice is paid or due by that particular salesmen. every day they take some stock from my warehouse and go to market to sell and at the month end i need to know each salesman took what goods and how much he sold and how much is balance with him in his van. They will sell in market some times credit some time cash i need to put customer name also to check for the pending payments. at every month end i want to know how much sales did each salesman made and how much profit i make on the whole. If some one can make this i have another project similar for a factory producing oil cans. first of all unit price should not have any currency. In the purchase invoice from my suppliers i should have a option for discount so that if my supplier from whome i buy give me discount i can write there and deduct. if some one need more information then contact me.