View Groups Associated with Users Steps:
This service applies to hosted voicemail groups only. You can create a vm group that will go to a group of member.
Navigate to Groups from the main navigation.
Highlight the Group name you wish to change.
Click the hamburger menu and select Group members.
There's 2 columns here. Available Group Members on the left and Active Group Members on the right. You can move members in/out.
Hit Save when done making changes.