Hello you would have to edit the parent theme as there is no way to overwrite the include_once 'bookingtable/bookingtable.php';.
So to keep edits to the parent theme minimal, the whole code can be rewritten using wordpress get_template_part() as
if ( class_exists('rtbInit') ) {
get_template_part('bookingtable/bookingtable');
}
This way you can then copy the file to your child theme and make edits there.
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