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.
Assign a Global Parameter
You can assign global parameters to element properties, such as family parameters, as well as to instance and type project parameters.
Label 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 or to use its value to drive other parameters.