make it easy to manage variants price

it can be way easier to manage prices without having to go to each item and adding the price. or maybe exporting a csv file into excel

Export/import is indeed a possibility.
Also, we're currently working on the handling of characteristics/variants on the product edition interface of HikaMarket and it will be easier to handle that with this interface.
Our goal in the end is to port that product edition interface from HikaMarket's frontend back to the backend of HikaShop once it will be completely stable.