Billing Address form is one of the built-in forms and is used to control the billing address in the checkout flow on the storefront. You can find and edit the billing address form in Site > Forms section in StoreHippo Admin Panel.
Billing Address Page
Billing Address Form has the following fields by default:
Adding a custom field
You might want to gather more information from a customer for the billing address in the checkout flow on your store. To do so, you can add extra fields to the billing address form.
To create a new field in the form to collect more information, click on Add field button which allows you to add a custom field.