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.
User-defined attribute Comment, defined in the object’s user-defined attributes dialog box.
For more information about the user-defined attributes in templates and reports, see User-defined template attributes.