This is a template attribute. Template attributes can be used in filtering, or to retrieve data from the model to use in drawings and reports. For example, when you create a report, Tekla Structures replaces the attributes added in the report template with the corresponding object property values.
You can use the template attribute
MODEL_PATH in all content types to find the path to the current model, for example
C:\TeklaStructuresModels\New Model 1\.