Akhill, unfortunately no. You'll need to 'bookmark' each sheet on one of the dashboards, then add them to the other workbook, then re-create the dashboard. If you think this is a bit of a long way around you can vote up this dashboard bookmark idea. Or here's a similar copy/paste version. Vote away, Tableau really does listen.
Thanks Shawn. I have tried the bookmarking path but its **** irritating if you have a good number of worksheets to bring together..anyways thanks for the links..i have added my vote up there..hopefully they'll come up with something easier..