Try this
@{REPORT ORDER DETAILS:O.MenuItemName,O.ExactTotal.Sum.desc:(ODI=True):{0}:|}
>{REPORT ORDER DETAILS:O.MenuItemName,O.Quantity.Sum.desc,O.ExactTotal.Sum.desc:O.MenuItemName="$1"}
{REPORT ORDER DETAILS:' '+[O.PortionName],O.Quantity.Sum.desc,O.ExactTotal.Sum.desc:O.MenuItemName="$1":2}