At which stage is PO Line column?
After select branch/customer selection (customer that you wish to make sales order for), the next step is item selection, so when you click on quick entry (item selection) the Part code is the Item code (Item ordered for) ,
Quantity(how much customer ordered for) and due date.
You may use search parts if not sure of items code, and the system will show you options to choose from or use quick entry to add the items on the sales order.
May we know the version of webERP your using .
For more information, you may refer to the link below
http://www.weberp.org/weberp/doc/Manual/...OrderEntry
Thank you
