TNEW: How to stop guests from deleting GA tickets in TNEW and only pay for add-ons?

Hi,

We run into an issue that our guest deleted the GA ticket on the "Cart details Page" in TNEW before checkout and they only paid for Add-ons. Can we stop this transaction by stoping the guest to do checkout without choosing the GA?

Please advise, if we can make any changes for the GA performance set up in TNEW.

Thank you in advance.