Labor Category Form
This is simple, just add a labor category. Labor categories have to be unique. Try not to get carried away with too many categories... the idea is to make your labor list items easier to find, so try to limit the amount of categories you use, although there is really no limit.
The Reminder list item triggers one or more reminder master items to create a reminder(s) because you completed an RO with those reminder lists. If you are not using reminders, just leave it blank.