I work at a heliport class D (two weeks from cto). When there is a h60 say mid field downwind and another h60 2 mike final for that same runway I’d like to use tower applied because I just need to issue control instructions as necessary to one, so I don’t have to get pilot applied conformation from both. So using the tower applied I would tell mid field downwind to extend downwind turn base to follow h60 2 mile final. That should be it. From what my facility tells me “traffic to one is traffic to both.” Do I need to tell final about the 60 extending or can I leave it at that because I know the separation is there?