I used User-agent: * Disallow: /forum/ Disallow: /blog/ Code (markup): for my subdomains: http://forum.example.com http://blog.example.com Code (markup): to avoid duplicate content and I have set the preferred URL to http://example.com http://www.example.com Code (markup): as associated and the primary is http://example.com Code (markup): Thanks. Hope I did the right thing.... any feedback will be apprciated.