Lets see how to disable billing on a project under GCP step by step.
1. Goto Billing menu from the options.
2. Now click on “Account Management” from the Billing menu on left side.
3. It will open the projects linked to the billing account.
Click on three dots to see options in front of the particular project for which you want to disable billing.
4. Now click on disable billing and it will show below options.
5. Now confirm to disable billing, it will delete all resources and stop billing,
Make sure to take backup of any resources, containers, etc.