Provide dealers with a self-service platform for online ordering, querying, and reconciliation, freeing up most of the coordination work between customer service personnel and dealers. Provide a modeled promotion policy platform to the finance department to automatically execute the promotion policy when dealers place orders, solve the problems of "buy gifts" and "buy gifts and discounts", and automatically accrue and redeem dealer rebates based on contracts, pick-up, and payment receipts, and assess dealers accordingly. Provide a sales forecasting platform to the planning department, where the headquarters predicts the national sales of conventional products, and distributors predict the sales of new products in various regions and limit the quota of new products when picking up goods. Divide sales account sets by product line, distinguish and streamline multi-party settlement relationships for both parties, three parties, and returns.