Follow these steps to create a pivot table from multiple sources (same of other file). See attached example file.

Steps :
1a In Excel 2003 open the PivotTable and PivotChart wizard by choosing Data -> PivotTable and PivotChart Report.
1b In Excel 2007, press Alt+DP, then type P to open the wizard as there is no equivalent menu option.
2 Choose Multiple Consolidation ranges
3 Open file B as well
4 Choose relevant page field option
5 Simply select and add the ranges (highlighted cells) from this and other file. You can choose to have as many files (A+B)
6 Select New Sheet & Finish