For new products, since they are new products, it is impossible to accurately predict how the sales will be after they are put on the shelves. Combined with whether you ship by air or sea, the factory delivery time, and your expected sales, you can ship the first batch of goods and arrange for the second stocking. And you need to adjust the stocking plan at any time according to sales changes.

For old products, it is easier. Based on past sales performance, combined with the first-leg transportation time and the supplier's delivery time, you can basically plan the stocking cycle and quantity.