Use the following procedure to create a new, blank model file.
Tip: You can create a new model file by copying an existing model file with the Save As command. For more information, see Saving models.
From the File menu, choose New, or press CTRL+N (Windows) or Command+N (Mac).
If you already have a model open in the iThink/STELLA window, a message appears that asks you if you want to save changes to the currently open model.
Select whether or not you want to save changes to the currently open window.
A new, blank diagram opens in the iThink/STELLA window.
You can now start building the model and can save the new model.