Is there a way to forward email from one alias on a Yahoo/XTRA email account to a different address?

I have an old xtra.co.nz email address (as well as a couple of others) and many years ago I created a number of aliases for the XTRA account, so that my wife, my daughter and my company name all had unique email addresses sharing the account. Under Settings > Accounts I can see the primary account email address as well as the three aliases, and can set up a rule under the main account email address to forward emails to (say) my GMail address, but what I want to do is only forward emails sent to one of the aliases to a new address. Is this possible? I can't find a way to do this.

For extra information, most of the time I access this account through Outlook on my home PC. I know I can create a rule in Outlook to forward only the emails sent to one alias but this means I have to wait until the emails are downloaded to my home PC, which I might only get to do every few days. I would prefer to find a way to do it as soon as they are received on the Yahoo/XTRA mail server.