Little Known Trick with Worksets & View Filters in Revit.

When you are setting up the properties for a view filter, you may find you would like to use the workset of an object to filter by.  If said object happens to be in a linked file, you don't have access to filter by the worksets within the linked file.  That is unless you have a workset named exactly the same in your file as in the linked file. Then the workset is available, and it works!

To me, the biggest downside to this technique is you must create worksets in your model that will likely be empty, and could cause confusion for others working in the model.  So use with caution.