It sounds like you want most replies online to go to the sender and not the group.? If so, you should go to Admin > Settings and scroll down to the Message Policies section.? Under Reply To, set it for Sender instead of Group.
When replying online, just below the composition box, right side, there's a button to toggle the action taken.? If you've set the default to Group (which is probably where yours is now, It will say Private.? Once you click on that, the button on the left will be blue and say Reply to Sender instead of green and Reply to Group.
Duane
Duane