Questions
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Is there a way to tell Google a site has duplicated content?
As Chris said, you can rel=canonical pages on the small sites to pages on the portal site--but only if they're identical. If they're not identical you'll need a temporary (302) redirect will tell google that the page has been moved temporarily but that the new location shouldn't get any of the SEO value of the old page -- or permanent (301) redirect which tells google that the page has been moved and that Google should add the SEO value of the old page to that of the new page. Be sure to read through these before you decide what to do. Canonicalization and the Canonical Tag - Learn SEO - Moz Redirection - SEO Best Practices - Moz
On-Page / Site Optimization | | Chris.Menke0