You must create a manufacturer before creating a model.
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Click File > New > Model and Asset > Model.
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In the New Model dialog box, expand the material classes to select a model, and click Next.
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In the Main details section, enter the name in the Name box.
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In the Model Relationships section, select a manufacturer from the Manufacturer list, and click Finish.
You can also create a model from the Tree View. To create, expand the Material Types in the Tree View. Right-click the selected material class, and click Create Model.