Hi Long Nguyen,
Thanks, makes perfect sense to filter the parent Group_ID instead, and loop through the $new array to change the values of the cloned group and subfields.
Have tried and it works.
However, when I update a post, the 'changes' of values made through the filter does not show immediately. I have to refresh the post edit page again before the changes are shown.
This makes the user think that changes have not been made upon clicking 'update' of post.
