Group managers and webmasters can create a new member list in a group. A new member list is one that does not yet exist on the platform.
If a group has members who actually form a subgroup (the project managers in that group, for example), you can put those people in a member list. This makes it easy to send those members an email, invite them to an appointment, or tag (mention) them in a status update.
You will now be able to mention the group (using an @) in a status update or reply, or select it for an appointment or email.
You can also add an existing member list (a member list already being used on the platform) to the group.