class Category(MPTTModel):
        name = models.CharField(max_length=200)
        slug = models.SlugField()
        parent = TreeForeignKey('self', blank=True, null=True, related_name='child')
        description = models.TextField(blank=True,help_text="Optional")

class Product(MPTTModel):
	title = models.CharField(max_length=100)
	longtitle = models.CharField(max_length=100)
	slug = models.SlugField(max_length=100,help_text="Отображение в URL")
	parent = TreeForeignKey(Category, blank=True, null=True, related_name='child_product')
	image = models.ImageField(upload_to='images')
	album = models.ForeignKey(Gallery, blank=True)
	pdf = models.FileField(upload_to='pdf')
	text = models.TextField()

Категория
  субкатегория
    продукт 1 
    продукт 2

{% recursetree nodes %}
        
        <li>
              {{ node.name }}
            {% if not node.is_leaf_node %}
           
                <ul class="children">
                    {{ children }}
           
                </ul>
              
            {% endif %}
        </li>
    {% endrecursetree %}

{% recursetree nodes %}
    <li>
        {{ node.name }}
        {% if node.product %}
            {% for item in node.product %}
                {{ item.name }}
            {% endfor %}
        {% endif %}
        {% if not node.is_leaf_node %}
           
            <ul class="children">
                {{ children }}
            </ul>
        {% endif %}
    </li>
{% endrecursetree %}