I've searched through several books, checked some code repositories, but haven't found what I see on websites quite frequently. Maybe I don't know what to look for by name?
Simply, on a form which has "Bill-To" customer info, how to clone (or copy) the same data to a "Ship-To" column on the same form before processing.
Thanks for any info about this (preferably a PHP function, etc.) and where to find it.