BoltMail
I am trying to import a contact list but am unable to find the custom fields associated with my list.
When you import a list that has custom fields in it you will first need to create custom fields in the 'Manage Custom Fields' page in the 'Contact List' menu and associate them with the list you want to import to.

Once this is done you will be able to associate the headers or fields in your import file to the appropriate custom fields.