Take a look at the demo to see how it should end up functioning: https://arena-artemis.myshopify.com/products/anity-product-sample
Adding Short Description (Description excerpts)
Use Custom Field and add metafield to metafield sizechart.
You may following instruction about Shopify Metafield name key description_excerpt to add your short product description. You may add html format to Product metafield description excerpt.
<ul><li><span class="a-list-item">Wireless</span></li><li><span class="a-list-item">Motion Sensing</span></li><li><span class="a-list-item">Compatible with Several Consoles/Games</span></li><li><span class="a-list-item">Enough Action Buttons</span></li><li><span class="a-list-item">Ergonomic</span></li></ul>
- Click Save Custom Fields
Mass edit to add short description c_f.description_excerpt.
- Go to: https://shopify.com/admin/bulk?resource_name=Product&edit=metafields.c_f.c_f.description_excerpt:string
- Add product short description for each product.
. You can add html code to the desription to show list as sample.