CSV import of attribute values only (for product), using the existing attributes

[pl.sabotinov]

Hello everybody,

 

i am using prestashop 1.5.4.1 and today i have decided to bulk import some attributes of existing products in my store. I also want to use the existing attributes in my shop and add only some new values to the selected products. But when i use the csv combinations import of prestashop, each time i make an import, prestashop does create a new attribute with the values i have written. I have tried giving the exact position of the existing attribute or without giving any position and type of the attribute, but anyway prestashop everytime does create new attribute with new values, which i do not want. So is it possible to import only values to existing attributes for given product by its ID? Can some one explain me how to proceed.

 

Thanks in advance.