See solution in other versions of Excel:
Question: On a pivot table, how do I remove grand totals for columns in Microsoft Excel 2003/XP/2000/97?
Answer: Below is a pivot table with a grand total for the column called OrderID.
To remove this column grand total, select a cell in the pivot table. Right-click and then select "Table Options" from the popup menu.
When the PivotTable Options window appears, uncheck the checkbox called "Grand totals for columns". Click the OK button.
Now when you return to the spreadsheet, the grand total for the OrderID column will no longer be visible.
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