For your inventory items to get replenished automatically, you can just simply create a purchase order.
The purpose of a Purchase Order (PO) is to increase your stock levels by ordering things from a supplier. After adding your suppliers, you may then create purchase orders for them.
You can watch the Video or follow the Steps below:
Add a purchase order by clicking Add Purchase Order.
2. Complete the details and click SAVE to save as draft or you can choose to finalize the purchase order by clicking the arrow in the SAVE button and selecting Finalize.