A pivot table is a data summarization tool that, among other functions, can automatically sort, count, and total the data stored in one table or spreadsheet and create a second table displaying the summarized data.

One weakness of Microsoft Excel comes from the missing option to enter or change the data directly in the data area of a pivot table. The pivot table is linked to the source data, and what you see in the cells of the table are read-only amounts. 

Pivot4U Add-in makes a pivot table editable. Once Pivot4U Add-in is installed, a click on the "add-ins" tab of Excel followed by the selection of Pivot4U makes the pivot table editable. Then set the cursor on any cell in the pivot table and change the value in the cell. When the value is changed, all totals are recalculated automatically.

Pivot4U Add-in 1.2 requires Microsoft Office 2007 and .NET Framework 2.0. The product is available immediately as a free evaluation version from www.excel4u.net. The evaluation version can be tried for 14 days before making the purchase of $79.99.