BIM Q&A | How to Set Default Values for Instance Parameters in Revit System Families?
As the title indicates, it is possible to adjust the default values of instance parameters for external families in Revit. Once loaded into a project, these parameter values can be preset to fixed defaults. But what about instance parameters in system families? Do they offer similar functionality? If so, how can you modify system families such as floors, walls, and ceilings?
The version of Revit in question is 2014.
Below are some reference images for clarification:
External Building Family:

System Family:
















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