尝试
let Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
#"Grouped Rows" = Table.Group(Source, {"Item", "Description"}, {
{"Qty", each List.Sum([Qty]), type number},
{"lots", each Text.Combine(Table.AddColumn(_, "Custom", each Text.From([Lot])&"("&Text.From([Qty])&")")[Custom],","), type text}
})
in #"Grouped Rows"