TOPIC: Replace data in admin Registration Records list

We use DT Register for a children's theater camp registration. The parent registers and pays and we collect the child's name in a custom field that is required on the registration form.

We do not use Discount Codes and it would be EXTREMELY helpful to replace the Discount Code column with the Child's Name in the Admin Registration Records list.

Can someone point me to the php file and location where I would make that change?

Thanks in advance.