Hi,
Not in the HikaShop interface, but it's easy to do if you have access to your database via PHPMyAdmin (most hostings provide it).
PHPMyadmin allows you to export/import data to a table and do so with CSV files that can be openned in Excel (if modification is necessary).
stackoverflow.com/questions/21936508/how...admin-table-into-csv
So you if you already have a characteristic with values configured on your shop, you can export the table hikashop_characteristic as a CSV. Then, you can open it in Excel to add entries with the same format than the data already in there. And you can import back the CSV to your PHPMyAdmin to get the new data in the hikashop_characteristic table.