The product type (custom) field is for a set of common specific characteristics in products or goods.
- Enable the toggle of Read Value from field instead of mapping (static value)
Static Value is when you want to apply the same value to all the products in the feed. You can do this by enabling the toggle and enter the Static Value in the field provided instead of entering the column index or name.
So for this product type (custom) field, only the custom product type in Shopify will be updated.