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To save FormSet changes when related models are involved, the following steps can be followed:

1. Create a view function that handles the FormSet POST data and saves changes to the related models.
2. Instantiate the FormSet in the view function and validate the form data.
3. If the form data is valid, iterate over the FormSet instances and save changes to the related models.
4. If the related models have foreign keys, add them to the FormSet forms using the formfield_callback method.
5. Use the commit=False parameter when saving related model instances to prevent them from being immediately saved to the database.
6. After saving all related model instances, save the main model instance (if present) and commit all changes to the database using the commit() method.