select SUBSTRING(A,1,CHARINDEX(' ',A,1)-1) AS GROUP_COL,
SUBSTRING(A,CHARINDEX(' ',A,1)+1,LEN(A)-CHARINDEX(' ',A,1)) AS SORT_COL,
COUNT(*) AS CNT
FROM (
SELECT 'ISB 23-132' AS A
UNION
SELECT 'ISB 23-133'
UNION
SELECT 'ISB 23-134'
UNION
SELECT 'I234.5 123'
UNION
SELECT 'I234.5 124'
UNION
SELECT 'I234.5 125') TEST
GROUP BY SUBSTRING(A,1,CHARINDEX(' ',A,1)-1),SUBSTRING(A,CHARINDEX(' ',A,1)+1,LEN(A)-CHARINDEX(' ',A,1))
ORDER BY SUBSTRING(A,CHARINDEX(' ',A,1)+1,LEN(A)-CHARINDEX(' ',A,1))