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Use this procedure to add columns to the content type in SharePoint 2010.
Click Site Actions and select Site Settings.
In the Site Settings menu, click the Site Content Types link in the Galleries section (see Figure 9-20).
Click the Create option to start the process of creating a new Link to a Document content type. Give the new content type a name and description. Select the parent category as Document Content Types and the parent as Link to a Document. You can create a new group if you’d like or just accept the default of Custom Content Types. When you are finished, click OK (see Figure 9-21).