A merchant is creating two websites targeting different region on a single Magento instance.

Change the scope of the Stock attribute from Global to website calculate the stock value for each Product per Website and save the inventory value at the appropriate Website scope

Create inventory Sources for each warehouse and retain store, create Stocks for each website from the appropriate Sources, and define the Sources and quantities for each Product.

Create an inventory Source for each Website create Stocks for each product, assign the Stocks to the appropriate Sources, and define the stock quantities for each Product.

Copy all of the products, assign a copy to each Website, calculate the stock value for each Product per Website, and save it to the appropriate copy of the Product.