I have a client who runs a small daycare center. She wants to offer parties i.e. Toddler Halloween Dance with say 15 toddlers. Customers can book up to 5 child places at a time and with that booking they get 1 FREE adult place. She tried a 'dry run' - unfortunately, despite saying she could only cater for 10 adults max - around 30 showed up. Is there a way to add a second line to the booking indicating the number of adult places required? So the transaction is all in one, rather than have to create a second booking for Extra adults.