One way to do this is...
SELECT ItemName
, SUM(CASE [Status] WHEN 'Ordered' THEN Quantity ELSE 0 END) as OrderedQty
, SUM(CASE [Status] WHEN 'Loaded' THEN Quantity ELSE 0 END) as LoadedQuantity
, SUM(CASE [Status] WHEN 'Shipped' THEN Quantity ELSE 0 END) as ShippedQuantity
, SUM(CASE [Status] WHEN 'Billed' THEN Quantity ELSE 0 END) as BilledQuantity
FROM tbl_Inventory
GROUP BY ItemName