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1. Re: Does anyone know if I can use one drop down filter that the user can select and it will apply the filter across multiple data sources on the dashboard?
You can use global filters, but that will apply to any other dashboards as well. Otherwise you can look at parameter based filters, wait until v8 where you can define the scope of filters, or see if action filters will work for you instead of a drop down.
Here's some info on parameter filtering: http://www.tableausoftware.com/about/blog/2012/7/filtering-parameters-18326