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MS Sharepoint 2010 Site Navigation

How can I hide the top level navigation on a subsite?  I do not see an option for Top link bar.
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If you have the Publishing feature enabled, you will not see a "Top Link" bar option. It would have to be done using the "Navigation" option under "Look and Feel".
in your sub site Under look and feel   click Navigation and choose    Display the navigation items below the current site  

the default is
Display the same navigation items as the parent site