By default, modules are saved in the model file (.ITMX or .STMX). When you save a model that contains modules, all changes made to the entire model (including changes made to modules connected to it) are also saved.
You can also:
Each of these procedures is described below.
From the File menu, choose Save.
All changes made anywhere in the model, including changes made to modules, will be saved.
From the File menu, choose Save As.
The "Save model files as" dialog box will open.
Navigate to the location where you want to save the new model file.
Note: If you have modules saved as separate files they will be saved in a directory names modelname_modules, so Save As will create a new directory in this case.
Choose how you want to name the module file:
The next time you save the model, the module will be saved in a separate (.ITMX) file according to your selection.
Note: All module files are saved as .ITMX files, regardless of whether they're saved with Stella.
From the File menu, choose Open, and then select the module file (.ITMX) that you want to save as a model.
A message will appear that says that the template model will be converted to a model file.
Click OK.
The module will appear as a model on the diagram.
From the File menu, choose Save.
The "Save model file as" dialog box will open.
Click Save.
The module will be saved as a model. If the module contained other modules, the connections to the sub-modules will be retained.