No, it will disappear from bindings.
A work around would be to add the recorsdet code in its original form like:
<?php
/*
?>
<?php
// your original recordset code here
?>
<?php
*/
?>
That way you can have the recordset in a readable format for Dreamweaver but the code will be ignored since it is commented out. Then you can add your copy of the recordset with the updated code below. Yours will run, but the bindings will be created from the commented out one.