To change the parent group of an existing group, follow these steps:
Step 1: edit the group and click on Change Parent Group.
Step 2: You will be presented with a dialog which will show all the top-level groups from the microsite. Click on the arrow icons to expand the top group and view its sub-groups. Click on any group to select it as the new parent group. Then click on the Change to Selected Parent button. In case the group was not a top-level group and you want to move it to the top-level (which doesn't have any parent), click on the Move to Top Level button.
Step 3: When you change the parent group, the new parent may need its members to be synced so that the parent group includes all members of the newly moved child group. After the save, you will see this message about required Group Members sync which needs to be done.
Step 4: Click on the breadcrumb to open the parent group and go to its members tab
Step 5: Click on the Sync button, and click OK to confirm the sync operation. Depending on the number of users who need to be added to the new parent, the operation may take several minutes to complete.
Click OK to confirm the action.
What to expect after this:
The new parent group should have all the members from the newly added child group and the Sync button should no longer be available on the parent group's members list. You will still need to make changes to an older parent group to remove members from there, in case they need to be removed as a result of the child group coming out of its child groups. This is not done automatically because system can't determine which members need to be removed from the older parent as the member in an older parent may have been present by manual addition or via other child groups. You can use Remove Non Exclusive action on the old parent group, to remove any user from a group that is not in any current children.
Note: this action is available only for site admins