Im trying to sell products in single or in groups. For example 1 piece or 12 pieces (case size). The store does not seem to be able to calculate the difference in weight. One piece is shipped for the same weight as 12.
In addition, I sell multiple items in my store. Shopify seems to use the last orders package size to calculate the next shipping rate. I understand there is a package variant involved. How Do I address this? Any help on these items would be appreciated.