Power Query [Résolu] Groupement, pivot et plusieurs colonnes

let
  Source = Excel.CurrentWorkbook(){[Name = "Départ"]}[Content],
  ColName = Table.ColumnNames(Source),
  #"Grouped Rows" = Table.Combine(
    Table.Group(
      Source,
      ColName{0},
      {{"Custom",
          each let x = Table.RowCount(_) in
              Table.RemoveColumns(
                Table.FromRows({List.Combine(Table.ToRows(_))},
                  List.TransformMany({1 .. x}, (y) => ColName, (y, z) => z & " " & (if Text.From(y) = "1" then "" else Text.From(y)))),
                List.TransformMany({2 .. x}, (y) => {y}, (y, z) => ColName{0} & " " & Text.From(z)))
      }}
    )[Custom]
  )
in
  #"Grouped Rows"