Consider:
Query1: CO_UNION
SELECT MaNPL, Co1 AS Data, "C1" AS Src FROM Tnpl
UNION SELECT MaNPL, Co2, "C2" FROM Tnpl
UNION SELECT MaNPL, Co3, "C3" FROM Tnpl
UNION SELECT MaNPL, Co4, "C5" FROM Tnpl
UNION SELECT MaNPL, Co5, "C5" FROM Tnpl;
Query2:
SELECT CO_UNION.Src, Sum(CO_UNION.Data) AS SumOfData, [Forms]![Fbe]![Combo1] AS NPL1, [Forms]![Fbe]![Combo2] AS NPL2, [Forms]![Fbe]![Combo3] AS NPL3
FROM CO_UNION
WHERE (((CO_UNION.MaNPL)=[Forms]![Fbe]![Combo1] Or (CO_UNION.MaNPL)=[Forms]![Fbe]![Combo2] Or (CO_UNION.MaNPL)=[Forms]![Fbe]![Combo3]))
GROUP BY CO_UNION.Src, [Forms]![Fbe]![Combo1], [Forms]![Fbe]![Combo2], [Forms]![Fbe]![Combo3];