...
You can link this order with a project from the Projects list if the Project Management Costing functionality is turned on the Administration > Settings > General Settings Project Costing. If the items in this document are being purchased for different projects, and you need to specify different projects for different items, you can move the Project field from the Main tab as a column to the table on the Inventory tab. For this, use the Setting button on the toolbar (for more information, see Document Toolbar).
...