If you keep the global filter, the only way to do this is to make a duplicate of your source and recreate the chart from that source without the filter. Other filters will not work either though. You could wait until v8 where you can apply a filter to select worksheets. You could remove the global filter and use action filters to only filter certain sheets on the dashboard: http://kb.tableausoftware.com/articles/knowledgebase/creating-filter-actions-dashboards
thanks for your prompt reply, i tried duplicating the data source and it worked where i could keep the other vizzes on global filter and a specific one just on an individual local filter. Thank you.
It would be great though if I can do it for select sheets. waiting for v8.