Create a specific instance in the admin?

If I have models like below where I have a multiple instance of the
base manufacturer (could be inherited or I could just have a OneToOne
relationship):
class Manufacturer(models.Model):
name = models.CharField(max_length=128)

class ManuType1(Manufacturer):
def myfunc(self, str):
return 'manutype1'

class ManuType2(Manufacturer):
def myfunc(self, str):
return 'manutype2'

Is there a way to make the admin allow the selection of the specific
instance (ManuType1, ManuType2 ...) whenever we want to add a new
Manufacturer?

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