How I can get chained objects in my project

Question

I have chained models -> Category - Brand - Type. For example :

• Category : Light vehicle
• Brand : Volkswagen
• Type : Passat

And I have an Post Model. Question : How i can get chained objects in the form? Code:

class Category(models.Model):
    title = models.CharField(max_length=32)
    slug = models.SlugField(max_length=32)

    def __str__(self):
        return "%s" % self.title

class Brand(models.Model):
    category = models.ForeignKey(Category, on_delete=models.CASCADE)
    title = models.CharField(max_length=32)

    def __str__(self):
        return "%s" % self.title

class Type(models.Model):
    category = models.ForeignKey(Category, on_delete=models.CASCADE)
    brand = ChainedForeignKey(
        'Brand',
        chained_field="category",
        chained_model_field="category",
        show_all=False,
        auto_choose=True
    )
    title = models.CharField('Модель автомобіля', max_length=32)
    slug = models.SlugField(max_length=32)

    def __str__(self):
        return "%s" % self.title

Post Model :

class Post(models.Model):
    category = models.ForeignKey(Category, on_delete=models.CASCADE)
    brand = models.ForeignKey(Brand, on_delete=models.CASCADE)
    type = models.ForeignKey(Type, on_delete=models.CASCADE)
......

    def __str__(self):
        return "{} {}".format(self.brand, self.type)

I need to create a form with chained objects. How I can get it ? or how to edit my Post model?