There are several Excel 2007 help topics that provide information on creating pivot table reports.
Excel 2007 related help topics:
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Overview of PivotTable reports and PivotChart reports
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PivotTable I: Get started with PivotTable reports in Excel 2007 (20-30 minute training)
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Create or delete a PivotTable or PivotChart report
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Overview of values, custom calculations, and formulas in a PivotTable or PivotChart report
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PivotTable options
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Field settings
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Overview of charting
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Create a chart
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Overview of Online Analytical Processing (OLAP)