Post Views: 6,667 As you already know, there are three kinds of families in Revit®: system families, model-in-place families and external (loadable) families (also know as .RFA files). Some Revit® categories are exclusively system categories (families of those categories can be created only in project environment), for example: Walls, Stairs, Floors and similar categories. There … Continue reading How to save system family as external loadable family