Want two IDs and a single inbox…Just go the following link with ur existing ID :

http://is.gd/3d09d (link shortned)

https://login.yahoo.com/config/login_verify2?

.src=ym&.done=http%3A%2F%2Fedit.yahoo.com

%2Fconfig%2Flist_alias%3F.src%3Dym%26.intl%3Dus

(original link)

Visit the Above link…
Then Log in..

after that you can edit your current account and add another ID to it with the SAME DOMAIN.

After you create you sub-id (also known as Dot Address),you can login to messenger with any of your id and also send the mail from any of the address.

Thus with a single inbox,u can handle official as well as domestic works…..