Class Standards The Machine Design_Classes.sta file, located in the Standards folder, contains a number of pre-defined class standards. To use the pre-defined classes in a drawing: 1. Select Tools > Organization. The Organization dialog box opens. Click the Classes tab. 2. Click New. The New Class dialog box displays. 3. Click Import Classes and choose Machine Design_Classes.sta from the list. 4. Select the desired classes and click OK. 5. Click OK in the Organization dialog box to return to the drawing. Click the classes list on the Data bar to list the classes that are available for use in the drawing.