using (Transaction tx = new Transaction(doc))
{
    tx.Start("复制元素");

    Group group = doc.Create.NewGroup(
      uidoc.Selection.GetElementIds());

    LocationPoint location = group.Location
      as LocationPoint;

    XYZ p = location.Point;
    XYZ newPoint = new XYZ(p.X, p.Y + 10, p.Z);

    Group newGroup = doc.Create.PlaceGroup(
      newPoint, group.GroupType);

    group.UngroupMembers();


    ICollection<ElementId> eIds
      = newGroup.UngroupMembers(); 

    tx.Commit();
    Print("成功");
}