Problem with cart implementation

Hello,

I'm working on a school project in Laravel and I'm stuck on one of the last parts. It is about "selling" (without a payment gateway) tickets for races. How do I modify the database table (I have reservations, users, races and categories) so that I can send ticket prices to the database when they vary based on category (silver, gold, etc.) and also if it is for an adult or not. There is a related problem in the cart implementation, where I don't know how to send in a price for a child in the silver category, so the cart instructions for Laravel 8 don't work. Hopefully you can see what my problem is. Thank you for your help. https://omegle.onl/