Hi - When you are finished creating or editing your listing you can click SAVE, and the listing will save without posting. When you click POST or SCHEDULE, it will perform one of those functions, and will save automatically as well (you don't have to click SAVE first). If you want to edit a scheduled listing, just make the changes and click SAVE. You will then be asked to confirm your save, since it is a scheduled listing. Just confirm at the bottom of the page and it will save over your previous listing and schedule the new saved listing according to your original settings(no need to reschedule).As you found out, SAVE AS NEW creates a duplicate copy.