@Amanda660 when you create a reservation alteration, you get to adjust the payments as you wish. So, if you want them to be "registered" and "counted" with ABB then you change the entire reservation to say 5 instead of 3 and then adjust the payment to the amount that you've agreed to... it isn't a perfect system, but best you can do
DO NOT ever alter a reservation sub-24 hours to arrival (it can mess up the WHOLE payout!!)
Either adjust prior to 24hours or after you've been paid 24 hours after arrival