transformation rows into columns

Copy and paste the entire code for example.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("tZNNbsIwEIWvYmU9Sj2Of+IlCFA3lIqqK8QigqQgpYoELRJH4hxcrAHPJFHUHWGR5Mlv/I3nWVmtIi8+zmWZiZcIounnsn4LehCMtjFiZ6m3jFLGUkZrWEXjt5l4jDCrDkW2/3kM4sV4V53zzjTobx5EVskgEMGlrMk0bHpIGw+8ZFk3Su78+WL6JHJ//GHpvs5IjLNdmwvjE6o1YB3DaIUxGhqJgFxVt7YBPpq8PwO7vF6+9vkzyPc0XrPtuY3DhppUGUZ4Q/vIci1dsXRcgyZGE8KYL0bDU3tZDMb1uk5inn1n2+q389MQ1nofm5tIQHsXJFmGWQoarNNUozBO3J1/zMtCHPPDab9pTy9DldO0L+EbIqNlO+rm6VvPa9N/f5chmJP81PB02Ga5KgFUNJ3uE0Ez0xpFCcg4tZ2bE0U47/WSD9xi/Qc=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"Prenom / Projet / facturation" = _t, Devise = _t, rec_quantité = _t, rec_montant = _t, rec_total = _t, dep_quantité = _t, dep_montant = _t, dep_total = _t, marge = _t, taux = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Prenom / Projet / facturation", type text}, {"Devise", type text}, {"rec_quantité", type number}, {"rec_montant", type number}, {"rec_total", type number}, {"dep_quantité", type number}, {"dep_montant", Int64.Type}, {"dep_total", Int64.Type}, {"marge", type text}, {"taux", type number}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each if not Text.EndsWith([#"Prenom / Projet / facturation"],"/") then null else Text.BeforeDelimiter([#"Prenom / Projet / facturation"], "/")),
    #"Filled Down" = Table.FillDown(#"Added Custom",{"Custom"}),
    #"Filtered Rows" = Table.SelectRows(#"Filled Down", each not Text.Contains([#"Prenom / Projet / facturation"], "/")),
    #"Reordered Columns" = Table.ReorderColumns(#"Filtered Rows",{"Custom", "Prenom / Projet / facturation", "Devise", "rec_quantité", "rec_montant", "rec_total", "dep_quantité", "dep_montant", "dep_total", "marge", "taux"}),
    #"Added Index" = Table.AddIndexColumn(#"Reordered Columns", "Index", 0, 1, Int64.Type),
    #"Calculated Modulo" = Table.TransformColumns(#"Added Index", {{"Index", each Number.Mod(_, 2), type number}}),
    #"Pivoted Column" = Table.Pivot(Table.TransformColumnTypes(#"Calculated Modulo", {{"Index", type text}}, "en-US"), List.Distinct(Table.TransformColumnTypes(#"Calculated Modulo", {{"Index", type text}}, "en-US")[Index]), "Index", "Prenom / Projet / facturation"),
    #"Reordered Columns1" = Table.ReorderColumns(#"Pivoted Column",{"Custom", "0", "1", "Devise", "rec_quantité", "rec_montant", "rec_total", "dep_quantité", "dep_montant", "dep_total", "marge", "taux"})
in
    #"Reordered Columns1"