First thing first you need to register a new dot name from yahoo but do not register a yahoo email.
STEPS
1) Goto the "Sign In" www.yahoo.com
2) Click the "Sign up for Yahoo!
3) Now you're in the register page
4) Fill up all the neccessary details
5) Now make sure you "UNCHECK" this option >>>> "Yahoo! Mail: Create my free Yahoo! email address. "
6) Once you're registered !!! Click the link below
http://edit.yahoo.com/config/login?....ym%26.intl%3Du
7) It will ask for your password then enter it.
Cool Now you will come to a page that says "Create an extra email address"
9) Then create the dot name you want to make as your secondary dot name (a sub profile)
Note this follow the step carefully and you shall succeed cool enjoy....
STEPS
1) Goto the "Sign In" www.yahoo.com
2) Click the "Sign up for Yahoo!
3) Now you're in the register page
4) Fill up all the neccessary details
5) Now make sure you "UNCHECK" this option >>>> "Yahoo! Mail: Create my free Yahoo! email address. "
6) Once you're registered !!! Click the link below
http://edit.yahoo.com/config/login?....ym%26.intl%3Du
7) It will ask for your password then enter it.
Cool Now you will come to a page that says "Create an extra email address"
9) Then create the dot name you want to make as your secondary dot name (a sub profile)
Note this follow the step carefully and you shall succeed cool enjoy....