Custom "Fee Type"

Hei!
What is shown to the end-user part of the price breakdown is the original is the item cost plus the several fees coming on top. As I understand the fee label comes from the “Fee Type” property of an enterprise fee. This property has 5 possible values in our instance in Norway: “Packing”, “Transport”, “Admin”, “Sales”, Fundraising".
How do I add a new value to the list?
Thanks!
/Olivier