You can share a workbook with those who are members of the same network. You can use shared workbooks to create and edit formulas, change formatting or even add sheets.
This is what you do:
1. Click the Review tab. Click Protect and Share Workbook in the Changes group.
2. Select Sharing with track changes.
3. You can define a password for the workbook, but this is not mandatory.
4. Save the workbook when prompted to do so.
Save the shared workbook at a place in the network where other users can access it.
Everyone with access to a place in a network where a shared workbook is saved has the same access to the shared workbook.