Create a Purchase Order
If you want to create a Purchase Order you should go to Stock Control -> Purchase Order.
Here you can see all the products which need to purchase. You also can add products manually.
Then you must select a vendor from a select vendor drop-down box. This, you should select the address for Bill To and Ship To via the respective drop-down boxes.
After All, you can enter the quantity for each product you want to order and click on the Create button.