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So, Revit is the cool kid on the block that everyone wants to be. Everyone has been trying to make it so multiple people can access the same file at the same time. That is basically the first thing Revit did. I would say Autodesk did that, but Revit had that technology before Autodesk acquired them. Let us go ahead and activate work sharing!
Before you get started, download the files from the Files drop-down in the toolbar.
If it asks you to save the model, do it.
In the next dialog, click the Within your network choice and Click OK.
Hit the Save button.
Click Yes for the next Save File as Central Model.
Click OK.
Click the Synchronize button:
Close the model.
Click Open.
Select the model you were just working in.
Make sure you have the Create New Local button checked: