CSV File Categories Need explaining

At the top of your csv file you have your tables, if you have i.e three categories example

Computer
Components
Motherboards

Would the table titles be
parent_category,categories,categories

i can't seem to get the third category to work, as the clients up datable stock file comes with three categories in a cat,cat,cat ie.Computer,Components,Motherboards so going through the file to add characters is out of the question as the file is 9MB plus

Can anyone help??????

Are you sure that your product should be attached to these three categories and not only to the motherboards category ?
From what I understand, motherboards are under the category components which itself is under the computer category.
So if you already have that category hierarchy in HikaShop, you just need to give the direct category to the system and delete the two other categories columns.