Hi,
In your CSV, you need to:
1. Add a Size column in your CSV
2. Make sure that you already have a "Size" characteristic with all the values that you need in your HikaShop backend.
3. Add an additional row before the variants with the code APT1685 with the same product name and product description and with the default size you want filled in the Size column
4. Rename all the columns to fit with the column names of HikaShop.
So instead of:
Parent Sku Variation SKU Product Name UPC Color Price Weight Description
you would have:
product_parent_id product_code product_name UPC Color price_value product_weight product_description
5. in the size column, make sure that each main product has the default value for the size dropdown, and each variant has its corresponding value.
Then, you'll be able to import your CSV.