Sales is mainly a quantitative term, into the number of goods that is into the purchase of goods, sales is the number of sales, inventory is the number of inventory. Of course, this is a general concept, specifically refers to a particular nature of the product to buy, sell, the number of inventory. For example, red Fuji apples into the 8 boxes, today sold out 5 boxes, the remaining that is the number of inventory there are 3 boxes.

I think you just need to know these on it. Inventory of this thing itself should be a form, if you run the market, the company will require the salesman in accordance with the day, month, half a year or the whole year to fill out such a form in order to over to the scientific and reasonable monitoring of market demand at any time to adjust the inventory structure to achieve better sales expectations.