The Inventory and Services tab is used for creating a list of goods and services lists for purchasing.
The "Purchase Order (create)" form. The Payment Terms tab
To add an inventory item, click the Add or Pick button (refer to Using with the pick operation). In the Item column, select an item from the Items list or create a new item. For more details, refer to Items. Alternatively, you can import the list of items with all the details from an Excel document. For this, click the 
button on the table toolbar and follow the