To edit an excel file with multiple users, first open spreadsheet you want to share.
Click the review tab.
Click on share workbook.
Select share workbook again.
Place a check mark in the check box at the top of the “Editing” tab on the Share Workbook pop-up window.
Click the advanced tab at the top of the Share Workbook pop-up window.
A variety of customizations for controlling multiple users should now appear. Choose desired options on the Advanced Tab.
Click OK to save the workbook. Now multiple users can edit the Spreadsheet.