If you want to add more fields in the product enquiry form of your e-commerce site, then you need to create the metafields first. To know how to add metafields, go to the helpcenter - https://help.storehippo.com/topic/metafields. After you have added the metafields, you can proceed to edit the form. Follow the steps mentioned below:
Now, the fields will be added to the product enquiry form of your ecommerce site. To know more about editing the product enquiry form, visit the helpcenter - https://help.storehippo.com/topic/how-to-edit-product-enquiry-form