How to Merge Changes from Different Excel 2013 Users
Click the OK button to close the Excel Options dialog box.
The Compare and Merge Workbooks button appears at the end of the Quick Access toolbar. (Its icon is an outlined circle.)
When you click the Compare and Merge Workbooks button that you added to the Quick Access toolbar with the original workbook file open in Excel, the program opens the Select Files to Merge Into Current Workbook dialog box. Here, you select the drive and folder that contain the copies of the shared workbook file edited by your co-workers.