Forgive me if this is a silly question, but I am new to this wonderful component

Anyway…
I have a pretty basic CSV file to import and so far it looks pretty straightforward. However, I have a couple of Extra Fields to import, namely Part Number and Price. Do I include the path, same principle as Category (e.g. extra_field/part_number and extra_field/price?
…or am I on the wrong track?
Please advice me of the correct method.
Many thanks in advance.