NetHunt records consist of fields. When you create a record, you fill out its fields that populate the record's content.
In order to create a record structure, you need to fill out the record with fields. NetHunt offers a variety of fields available in the folder settings:
Once you add fields, all the records belonging to one folder will have the same field set.
You can always edit the folder structure in its settings (add/edit/remove fields) if you have such permission.