The Groups panel displays the groups the selected object is a member of. This panel only shows if the object is the member of at least one group.
|Select one of the object's groups.
|Add this object to a new group.
|Sample a group to add this object to.
|Open the properties of the selected group.
|Remove this object from the selected group.
Create a copy of the selected object. This copy will belong to all the same groups as the original.