Want to add a "kids" price, or some alternate price for the same package?
Guest Based Addons
Guest based addons are addons that when purchased add a guest to the reservation for each addon purchased. For example, I could create a "Kid's package" addon, and in this example say 5 kids package addons were purchased, 5 guests would be added to the guest count on the backend.
How To Do This
First, create your addon. Follow this article here to see how to do so. The only difference is you'll want to make this addon based on "Guest count."
Packages based off a guest count will add a guest for each addon purchased.