How to Convert Raw data to Structure data

import your date without headers, then try this code.

= Table.Combine(Table.Group(Source,"Column1",{"n",each let a=Table.Skip(_) in Table.FromRows({{[Column2]{0}}&a[Column2]},{"Category"}&List.Transform(a[Column1],Text.Proper))},0,(x,y)=>Byte.From(y=null))[n])

Hi, 

let
Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WUtJRiolxVIrViVbyS8xNBXKDwRznnMTiYiDPAswLTk0uyczPA/IhSjPyk5IyU0HyzmA+2BQnZFO8UUyxBPM880pSi1KLS4ACvmABx3SQUiMDhBnOyGZ4gDmJEEXGYE4x3CFOaA4JzsxLByKl2FgA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"Column 1" = _t, #"Column 2" = _t]),
Proper = Table.TransformColumns(Source,{{"Column 1", Text.Proper, type text}}),
Group = Table.Group(
   Proper,
   {"Column 1"},
   {{"Data", each Table.PromoteHeaders(Table.Transpose(_))}},
   GroupKind.Local,
   (x,y) => if y[Column 1]="" then 1 else 0),
Formatted_Data = Table.Combine(Group[Data])
in
Formatted_Data

Stéphane