我有新创建的父位置，并在新的父位置创建了许多子位置。当我将项目添加到子位置但父项位置的金额为0.我想将所有金额的项目获取到父位置
Ex. page Stock by Location in Warehouse
parent: Physical Locations / Your Company / Stock but item = 0 (i want result is 14)
child : Physical Locations / Your Company / Stock / Shelf 1 item = 3
child : Physical Locations / Your Company / Stock / Shelf 2 item = 1
child : Physical Locations / Your Company / Stock / Shelf 3 item = 10
提前致谢。