Keep duplicated elements inside the container

It would be really time saving if duplicated elements would remain inside the container element, the original element is in.

The duplicate is always placed outside the container element and I have to drop it back in.

The same applies to duplicating containers. I would be great if the duplicated container could hold the same elements as the originals.

At the moment the container gets duplicated and the original elements are placed outside the duplicated container element.