For any notes on a single contact, you will have to add a contact property (in settings > properties > create property). There you can see all the existing properties created by Hubspot. If those aren't what you are looking for you can go to "create property" and then name it whatever you'd like. Once you do the import you will need to match the notes to the contact property you created in Hubspot. Hopefully that helps!
Thanks. After I import them will I have a chance to tag / updated these 600 from the other people in my database? Or do I need to somehow tag them as I import them? Just looking or how I'd segment them.