Here's a Select that will give you the required columns...
SELECT C.CustNum, C.LastNAme,
O.OrderNum, O.OrderDate,
I.Description, L.LIQuantity,
I.Cost, I.Price
FROM (Customer AS C INNER JOIN Orders AS O ON C.CustNum = O.OrdCustNum)
INNER JOIN (Item AS I INNER JOIN OrderLineItem AS L ON I.IemNum = L.LIItemNum)
ON O.OrderNum = L.LIOrdNum