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Unshare: Go to the source site, open the asset from contributor interface. Go to menu Content -> Share; System opens a pop up, which shows all the sites to which the asset is shared to (on the right side). Select and move the sites that you do not want to share the content. Save your changes. This is how you can unshare an asset.
Share from Contributor interface: Use the same feature (Content -> Share) to share the asset to desired sites. This is a context sensitive menu and hence may not be enabled if you do not have the right asset open.