rajagopal,
Its just a matter of taking each clusters out of the array and then unbundling the clusters and writing them as strings to a spreadsheet file. There is no VI to directly take an array of clusters and write them to a spreadsheet.
Please see this discussion forum for some ideas.
http://forums.ni.com/ni/board/message?board.id=170&message.id=49553&requireLogin=False
Nicholas C
National Instruments
Applications Engineering