You are able to add community members into a group. To add a members into a group:
1. If the person is already a community member, go to the group page, search for the person you want to invite under the "Add Member to Group", when the system find the person, click on his/her name to be added to the group. Group members can leave the group at anytime.
2. If the person you want to invite to a group is NOT already a community members, you can use our API documentation to invite the new members right trough a group. This way, the person will be a community members and a group member at the same time. You can find our API here66.