We are in the process of updated one of our websites and we are not sure how to do so. We currently have 2 wordpress installations on our server. The first is at http://www.21cls.com and the second is at http://www.21cls.com/tdc.
What we want to do is transition the http://www.21cls.com/tdc installation to the subdomain link http://www.tdc.21cls.com. I thought about changing the site url to the subdomain and figured this would work fine, however I am afraid that our old links that people may have for http://www.21cls.com/tdc will no longer work. Is there a way for all our old links to redirect to the new links at http://www.tdc.21cls.com?