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Data -> Subtotal

Data Analysis

Here is the question: how much did each sales rep sell?

 

Try it: Subtotal by Sales Rep
Make a copy of Original Data and rename it 2007 Sales Rep.

Select the entire spreadsheet
Go to Data-> Sort
Sort by Sales Rep
 

Go to Data ->Subtotal

 

At each change: Sales Rep.

You just sorted by Sales Rep, select Sales Rep for the Subtotal to match.

 

Use function: Sum.

 

Add the subtotal: Amount

Select columns A through F and go to Format-> Cells -> Hide Columns.

The spreadsheet should look like this.