{% load category_tags ocyan_oscar %}
{% category_tree parent=tree_category.category depth=category.depth as sub_tree_categories %}

                                <ul class="nav flex-column sub-nav">
                                  {% for sub_tree_category, info in sub_tree_categories %}
                                    {% if sub_tree_category|is_selected:category %}
                                    <li class="nav-item {% if sub_tree_category.pk == category.pk %}active{% endif %}">
                                        <a class="nav-link text-dark" href="{{ sub_tree_category.get_absolute_url }}">{% if sub_tree_category.pk == category.pk %}<strong>{{ sub_tree_category.name }}</strong>{% else %}{{ sub_tree_category.name }}{% endif %}</a>
                                    {% endif %}
                                    {% if info.has_children %}<ul class="nav flex-column sub-nav">{% else %}</li>{% endif %}
                                    {% for n in info.num_to_close %}
                                        </ul></li>
                                    {% endfor %}
                                  {% endfor %}
                                </ul>