BIM Q&A | How to Use Type Names to Control Entity Shapes in Revit Families
Understanding How to Add Parameter Types in Revit
Type parameters in Revit apply to all instances of a specific family type, whereas instance parameters affect only the individual elements you select. For example, consider a door family with multiple types, such as various sizes. If all door sizes share the same material, the material is controlled by a type parameter, while the size of each door is controlled by an instance parameter.
Type Parameter: When multiple identical types of the same family are loaded into a project, changing the value of a type parameter will update all instances of that type accordingly.
Instance Parameters: Conversely, if you modify an instance parameter for one element within a family, only that particular element changes, while others remain unaffected. When you create instance parameters, their names are automatically appended with two default characters, often appearing as unusual symbols.
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