Import category and subcategory

-- HikaShop version -- : 3.1.1
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-- PHP version -- : 5.5.32
-- Browser(s) name and version -- : firefox

Hi,
i have a problem with the category and subcategory import, i have this scenario:

main category -> subcategory-1 -> subcategory-2 -> product

I don't understand how to place the categories in csv files, i tried in this way:

product_name, product_code, parent_category, categories

but it doesn't work.

where i'm wrong?
Can you help me please?

thank you.

excuse but it's not clear for me

i have 3 category level:

main-category -> subcategory-1 -> subcategory-2
where i have to place the subcategory-1 and subcategory-2?

ok, i understand that is possible but i have to make two different import.

The first is a category tree import on two levels:

parent_category; categories
main-category, subcategory-1

then i made a 2nd import to set the sub-subcategory-1 under the subcategory-1

product_name; product_code; parent_category; categories
myproductname, myproductcode, subcategory-1, sub-subcategory-1

In this way it works.
I didn't find a way to made it in a single import.

ok, I will try in this way, now in excel format is clear, there is an empty cell.

thank you.