Global parameters are specific to a single project file, but are not assigned to categories like project parameters. Global parameters can be simple values, values derived from equations, or values taken from the model using other global parameters.
Note: These features are available only to students and to Autodesk Maintenance and Desktop Subscription customers for Revit 2016 software releases.
Assign a Global Parameter
You can assign global parameters to user-defined family parameters within an element.
Labeling a Dimension with a Global Parameter
From the Label option for a dimension, you can create a global parameter or select an existing global parameter to control the dimension value.