Enabling worksharing involves creating a master project file, known as a central file, from an existing model.
The central file stores the current ownership information for all worksets and elements in the project, and acts as the distribution point for all changes published to the file. All users should save their own local copy of the contents of the central file, edit locally in this workspace, and then synchronize with central to publish their save changes to the central file so that other users can see their work.
To enable worksharing and create a central file:
Worksets
panel
Worksets.
The Worksharing dialog displays, showing the default user-created worksets (Shared Levels and Grids, and Workset1).

You do not need to create worksets at this point. For more information, see Setting Up Worksets.
Save
As
Project.
When specifying a name for the central file, use a naming convention that identifies the file as the central file (for example, OfficeBuilding_CentralFile.rvt).
The file is now the central file for the project. Revit Architecture creates the file in the directory you specified and creates a backup folder for the file. For example, if your central file is called OfficeBuilding_CentralFile, you see the Revit project file and the backup folder (OfficeBuilding_CentralFile_backup) in the directory.

The backup folder contains the backup information and editing permission information for the central file. For more information on backup files and folders, see Workshared Project Rollback.
The Revit_temp folder contains files that provide progress information on operations (such as Synchronize with Central) to the Worksharing Monitor. For more information, see Worksharing Monitor.