Modify Cart

Hi

I’m trying to modify your theme as it doesn’t accept product variatios.

1.- I change the labels for adult price and child price to:
Single Occupancy

Double Occupancy

2.- Then i change the number_ticket input to min value 0 so the user can change Single Occupancy to 0 and Double Occupancy to 1 or different cases.
https://prnt.sc/gyidmj

3.- When i do that the cart goes empty. I’m trying to change your ajax_frontend.php file to be able to add just “child tickets”, both or just an “adult ticket”.
https://prnt.sc/gyierj

Could you please tell me what do i have to change in order to do this?

Thanks!