To prevent old items from being retained in an Excel 2007 pivot table, you can change an option setting, as shown in the short video below:

1. Right-click a cell in the pivot table
2. Click on PivotTable options
3. Click on the Data tab
4. In the Retain Items section, select None from the drop down list.
5. Click OK, then refresh the pivot table.

Details at www.contextures.com/xlPivot04.html

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For more information on pivot tables, see the Pivot Table Topics on my Contextures web site.