title: Django workflow to convert model superclass to subclass
body: <p>I have a Django project with two models: Applicant and Client, where Client is a subclass of Applicant. I would like some way of allowing a user to add an existing Applicant instance as a Client. I already have a view for Applicant instances, so I thought that having a Client model form on that page would do this, but from <a href="https://docs.djangoproject.com/en/1.4/topics/forms/modelforms/" rel="nofollow">the documentation</a> it does not look like you can initialize a model form with an instance of a superclass. I know I could do this by having code that goes directly to the database and adds a field to the subclass table, but is there a more Django-y way of doing it?</p>