this will do if the the string that has to be selected is of fixed length and after 2nd occurance of '/'
DECLARE @document varchar(64);
SELECT @document = 'CMS/00014456582/693362/004535/JCR_110914_NEW_4535 CMS'
select Substring(@document, CHARINDEX('/', @document,(SELECT CHARINDEX('/', @document)+1))+1,6)