Custom column based on several other columns

...a minor tweek to Lin's excellent solution, to match the 'expected outcome' above.

Kind regards, Ola

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("rZNRT8IwFIX/SrNnTFh1Qx4NiE8k6kx4IDw07AqN3TruWsz+vXdMjNal2WBPvevuOflu27NeBzycTMZhHAajILdK0fKgjDQ2BSr5/V2wGbU1rWRq9rRG7v+6nI7DWyqfUe9QZFTNNAJbyHIPKKFkS51Lo1HmO3buaXMJo2gAFz6N/7ishAFkC/qAT40fbC4RtkYe4eySgW8mi4Uu67N5g6zQKJQPvVvzN+FPcyJURrOlHoxXKEAY9o5wsJBvK9oKWQUCPTT9NA1UiyY+aUoPXGLxCBVLDNJR72rNixV0V6I+ZQ/gf10Cmbw5kNj41A3qpeqG+cnKFJTMgS3B7HVaX8h8xh4VvQ2U29Ozo5fmob/GoZmgxcGn5l0i+6upNbJ8kMjyYIjI8mCYyLozeVPoondr7hJZB6NT/Byafpo+kXXgOkfWAewZOgf1UvXFkXXor3HoEdnNFw==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [ID = _t, #"ID 2" = _t, Name = _t, Value = _t]),
    #"Grouped and Add.SortNo" = Table.Group(Source, {"ID"}, {{"Count", each Table.AddIndexColumn(_, "Sort",1,1), type table}}),
    #"Expanded Count1" = Table.ExpandTableColumn(#"Grouped and Add.SortNo", "Count", {"ID 2", "Name", "Value", "Sort"}, {"ID 2", "Name", "Value", "Sort"}),
    Group = Table.Group(#"Expanded Count1", {"ID 2"}, {{"Count", each _, type table}}),
    #"Added Add.SurveyNo (index)" = Table.AddIndexColumn(Group, "Custom Column", 0, 1),
    #"Changed Type" = Table.TransformColumnTypes(#"Added Add.SurveyNo (index)",{{"Custom Column", type text}}),
    #"Added Prefix" = Table.TransformColumns(#"Changed Type", {{"Custom Column", each "Survey " & _, type text}}),
    #"Removed Columns" = Table.RemoveColumns(#"Added Prefix",{"ID 2"}),
    #"Replaced Value" = Table.ReplaceValue(#"Removed Columns","Survey 0",null,Replacer.ReplaceValue,{"Custom Column"}),
    #"Expanded Count" = Table.ExpandTableColumn(#"Replaced Value", "Count", {"ID", "ID 2", "Name", "Sort", "Value"}, {"ID", "ID 2", "Name", "Sort", "Value"}),
    #"Sorted Rows" = Table.Sort(#"Expanded Count",{{"ID", Order.Ascending}, {"Sort", Order.Ascending}}),
    #"Removed SortNo" = Table.RemoveColumns(#"Sorted Rows",{"Sort"})
in
    #"Removed SortNo"