You can use CASE w/i a GROUP BY.
You can also use CASE w/i a SUM to control which values get aggregated. For example:
SELECT
a, b,
SUM(CASE WHEN KTVID = '12345' AND KTVValueType = '02.KTVSCHAF' THEN Value ELSE 0 END) AS KTVID_12345_02_Total,
SUM(Value) AS All_Values_Total
FROM
dbo.tablename
GROUP BY
a, b
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