WHERE
  (dbo.types.type = 'A')
  AND (
    dbo.Items.ItemID LIKE 'ABC%'
    OR dbo.Items.ItemID LIKE 'DEF%'
    OR dbo.Items.ItemID LIKE 'GHI%'
    OR dbo.Items.ItemID LIKE 'JKL%'
    OR (
    dbo.dbo.Items.ItemID LIKE 'MNO%'
    AND dbo.house.mfg = '1'
  )