Before You Begin This lesson requires some preparation. Here is a summary of the requirements:   1. Enable the Developers Toolbar You can review how to turn on the Developers toolbar in the Advanced Guide to Excel 2030 Page 184.   2. Download a Sample Spreadsheet The lesson has a sample file which you can download: Sales 2013 Original Data.xlsx 3. Enable the Macros After the Macro is programmed and saved, Macros need to be enabled in Excel so they can run. The steps to enable Macros can be found on Advanced Guide to Excel 2013 Page 270. This lesson includes a discussion on macro security levels. File ->Options->Customize Ribbon