[Django]-Create multiple instances of object from one form in django

Ran into your problem just now. Maybe you have found a solution since it’s been 5 years already. But if not, you can use formset factory for the model Item and the usual model form for the model Sale. This helps you create multiple instances of Item by rendering n number times your Item model in a form.

You can check this link https://medium.com/all-about-django/adding-forms-dynamically-to-a-django-formset-375f1090c2b0. It provides good example of how to use formset factory.