...
You can link this order with a project from the Projects list if the Project Costing functionality is enabled on the Administration > Settings > Project Costing form. If the items in this document are being requested 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 Settings button on the toolbar (for more information, see Document Toolbar).
...