Hi Ravi,
The second post above should help you out for design profile, you have to take a note there are nodes in toolkit - for adding a place holder of design profile or to add a design profile with a station and elevation values.
if the the intention is to create a design profile exactly following the EG surface then this post can help you, i will suggest it to be used on single profile first as a test and then run on all alignments and profiles. You should also need to check List Levels for this task.