I have two csv files. One for english store view, and one for french. French store is my default store. I have wanted import csv files separately, but when I imported second csv for english, it overrided default data. Csv files have this appearance.
sku,description,coul_type,_attribute_set,_product_websites,name,price,short_description,status,visibility,_type,tax_class_id
5053,Convertisseur 700 mA,,Accessories,base,5053,0,Convertisseur 700 mA,1,1,simple,0
sku,description,coul_type,_store,name,short_description
5053,700 mA converter,,en,5053,700 mA converter