How To Use Slicers in Excel: User Guide for Beginners
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http://www.excelcampus.com/pivot-tables/how-to-use-slicers/
Learn how to use and interact with Slicers in Excel. Slicers are available in Excel 2010+, and allow you to quickly filter a PivotTable or PivotChart. This video explains some tips for using slicers when multiple slicers are connected to one PivotTable or chart.