Mahesh,

I'm not sure what you're asking: You've developed DTS packages and you need to document them as they are, or how to migrate them to a new SQL Server box? 

I migrated several DTS packages during our cluster, using the DTS.DTSSQLServerStorageFlags library. 

There are issues moving DTS packages, especially DTS package history.

http://www.sqldts.com/default.aspx?t=6&s=105&i=212&p=1&a=0

Good luck,

Matthew