plz try this code
CREATE TABLE #TempTable(
docNo varchar(500))
INSERT INTO #TempTable (docNo)
VALUES ('CY/EV/13-14/00014')
SELECT * FROM #TempTable
Select SUBSTRING( docNo, charindex('/',docNo, 1)+1,2) + Substring(docNo,LEN(docNo) - Charindex('/',Reverse(docNo))+1,LEN(docNo)) as docNo
FROM #TempTable