To add a custom content type to your Sharepoint 2010 list follow the steps beneath. These steps don't really differ from the way you add content types in Sharepoint 2007, but then again practice never hurts.
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Click 'Library' in the SharePoint 2010 ribbon and then under 'Library Settings', click Advanced settings.
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Click Yes for Allow management of content types and then click OK.
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Under the Content Types section, click 'Add from existing site content types'.
- Selecte the content types you would like to add and then click Add. Finish by clicking 'Ok'