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You would think subcollections is something that’s available from shopify out of the box, but unfortunately it isn’t. 

In this tutorial, we're going to add sub-collections to our collection pages.

Compatible Themes: This code should work on all free Shopify themes (Dawn, Refresh, Craft, Studio, Publisher, Crave, Origin, Taste, Colorblock, Sense, Ride, Spotlight).

 

Create collection list theme section

Create collection metafield

• Name: Subcollection List
• Namespace and key: custom.subcollection_list
• Type: List of collections

Create new section collection-list-custom.liquid

{{ 'section-collection-list.css' | asset_url | stylesheet_tag }}
{{ 'component-card.css' | asset_url | stylesheet_tag }}
{{ 'component-slider.css' | asset_url | stylesheet_tag }}

{%- style -%}
.section-{{ section.id }}-padding {
  padding-top: {{ section.settings.padding_top | times: 0.75 | round: 0 }}px;
  padding-bottom: {{ section.settings.padding_bottom | times: 0.75 | round: 0 }}px;
}

@media screen and (min-width: 750px) {
  .section-{{ section.id }}-padding {
    padding-top: {{ section.settings.padding_top }}px;
    padding-bottom: {{ section.settings.padding_bottom }}px;
  }
}
{%- endstyle -%}

{%- liquid
  assign subcollections_info = collection.metafields.custom.subcollection_list.value | parse_json
  assign columns_mobile_int = section.settings.columns_mobile | plus: 0
  assign show_mobile_slider = false
  if section.settings.swipe_on_mobile and subcollections_info.size > columns_mobile_int
    assign show_mobile_slider = true
  endif
-%}

<div class="color-{{ section.settings.color_scheme }} gradient">
  <div class="collection-list-wrapper page-width isolate{% if show_mobile_slider %} page-width-desktop{% endif %}{% if section.settings.title == blank %} no-heading{% endif %} section-{{ section.id }}-padding">
    <slider-component class="slider-mobile-gutter">
      <ul class="collection-list contains-card contains-card--collection grid grid--{{ section.settings.columns_desktop }}-col-desktop grid--{{ section.settings.columns_mobile }}-col-tablet-down{% if section.settings.swipe_on_mobile %} slider slider--tablet grid--peek{% endif %}">
        {%- for subcollection in subcollections_info -%}
          {%- assign current_collection = collections[subcollection.handle] -%}
          {%- if current_collection -%}
            <li class="collection-list__item grid__item{% if show_mobile_slider %} slider__slide{% endif %}">
              {% render 'card-collection',
                card_collection: current_collection,
                media_aspect_ratio: section.settings.image_ratio,
                columns: section.settings.columns_desktop
              %}
            </li>
          {%- endif -%}
        {%- endfor -%}
      </ul>	 
    </slider-component>
  </div>
</div>

{% schema %}
{
  "name": "Collection List Custom",
  "tag": "section",
  "class": "section section-collection-list",
  "max_blocks": 15,
  "disabled_on": {
    "groups": ["header", "footer"]
  },
  "settings": [
    {
      "type": "select",
      "id": "image_ratio",
      "options": [
        {
          "value": "adapt",
          "label": "t:sections.collection-list.settings.image_ratio.options__1.label"
        },
        {
          "value": "portrait",
          "label": "t:sections.collection-list.settings.image_ratio.options__2.label"
        },
        {
          "value": "square",
          "label": "t:sections.collection-list.settings.image_ratio.options__3.label"
        }
      ],
      "default": "square",
      "label": "t:sections.collection-list.settings.image_ratio.label",
      "info": "t:sections.collection-list.settings.image_ratio.info"
    },
    {
      "type": "range",
      "id": "columns_desktop",
      "min": 1,
      "max": 5,
      "step": 1,
      "default": 3,
      "label": "t:sections.collection-list.settings.columns_desktop.label"
    },
    {
      "type": "color_scheme",
      "id": "color_scheme",
      "label": "t:sections.all.colors.label",
      "info": "t:sections.all.colors.has_cards_info",
      "default": "background-1"
    },
    {
      "type": "checkbox",
      "id": "show_view_all",
      "default": false,
      "label": "t:sections.collection-list.settings.show_view_all.label"
    },
    {
      "type": "header",
      "content": "t:sections.collection-list.settings.header_mobile.content"
    },
    {
      "type": "select",
      "id": "columns_mobile",
      "options": [
        {
          "value": "1",
          "label": "t:sections.collection-list.settings.columns_mobile.options__1.label"
        },
        {
          "value": "2",
          "label": "t:sections.collection-list.settings.columns_mobile.options__2.label"
        }
      ],
      "default": "1",
      "label": "t:sections.collection-list.settings.columns_mobile.label"
    },
    {
      "type": "checkbox",
      "id": "swipe_on_mobile",
      "default": false,
      "label": "t:sections.collection-list.settings.swipe_on_mobile.label"
    },
    {
      "type": "header",
      "content": "t:sections.all.padding.section_padding_heading"
    },
    {
      "type": "range",
      "id": "padding_top",
      "min": 0,
      "max": 100,
      "step": 4,
      "unit": "px",
      "label": "t:sections.all.padding.padding_top",
      "default": 36
    },
    {
      "type": "range",
      "id": "padding_bottom",
      "min": 0,
      "max": 100,
      "step": 4,
      "unit": "px",
      "label": "t:sections.all.padding.padding_bottom",
      "default": 36
    }
  ],
  "blocks": [
    {
      "type": "featured_collection",
      "name": "t:sections.collection-list.blocks.featured_collection.name",
      "settings": [
        {
          "type": "collection",
          "id": "collection",
          "label": "t:sections.collection-list.blocks.featured_collection.settings.collection.label"
        }
      ]
    }
  ],
  "presets": [
    {
      "name": "Collections List Custom"
    }
  ]
}
{% endschema %}

Add code in main-collection-product-grid.liquid

Only show product grid if there are products in the collection

{% if collection.all_products_count > 0 %}

... rest of code...

{% endif %}