New Yahoo Mail

I got an email from Yahoo about upgrading the account to the new beta service. Signed up for it because it seemed inevitable. The new look UI is refreshing and fast. They added a lot of features, competing with Gmail. However, after being spoilt by Google, I want more. For instance, there is no way to filter a set of emails based on an existing email. My inbox already has thousands of emails, thanks to the spam masters and I want to clean up now. For that, Iwant to move my important emails by selecting them and moving to a different folder. In Gmail, it is simple, by selecting the required email and creating a filter based on it. Couldn't figure out an easy way in Yahoo yet.