How do I edit the items sold by a vending machine?

Hello! I've imported an object to replace the High School Years vending machine (not quite sure why I chose that one exactly) and I tested it in game. It works, but I would like to change the items sold. The current ones are pizza rollups and some drinks.

It'd make me even happier if I could separate the new ones into their own pie menus, but since I am very new to this then my best bet is probably just changing what items are sold.


Thanks for any help! <3