Products from the same Product's Sub-Category

wines_from_same_vineyard.liquid

{% for vina_cat in store.category['vinas'].subcategories %}
{% for product_cat in product.categories %}

{% if vina_cat.id == product_cat.id %} // identify the vina category (monos)
  {% assign cat = vina_cat %}
{% endif %} 

{% end %}

<h2>{% t 'Wines from the same vineyard' %}</h2>
{% for prod in cat.products limit:8 %}
{% continue if prod.id == product.id %}
{{ product.name }}
{% endfor %}