How do I merge multiple sites into a single site?

If one wanted to combine 4 different sites into one site, how would you go about doing this? Ryan, Dearborn, MI Have a question? Ask it in our Webmaster Help Forum: www.google.com Want your question to be answered on a video like this? Follow us on Twitter and look for an announcement when we take new questions: twitter.com More videos: www.youtube.com Webmaster Central Blog: googlewebmastercentral.blogspot.com Webmaster Central: www.google.com