Merging Changes from Different Users
At some point in the sharing of a workbook, you'll want to update the workbook to incorporate the changes made by different users. When merging changes, you may also have to deal with conflicting changes made to the same cells and decide which changes to accept and which to reject. After you've merged all the input and decided how to deal with all the conflicting changes, you may want to turn off file sharing to prevent users from doing any further editing.