Matrix table

Anonymous , You need to use pivot

https://radacad.com/pivot-and-unpivot-with-power-bi

example code

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WSlTSUfJJLUvNUTBUitVB5huB+Ulo8knI8rEA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Customer = _t, Discount = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Customer", type text}, {"Discount", type text}}),
    #"Duplicated Column" = Table.DuplicateColumn(#"Changed Type", "Discount", "Discount - Copy"),
    #"Pivoted Column" = Table.Pivot(#"Duplicated Column", List.Distinct(#"Duplicated Column"[Discount]), "Discount", "Discount - Copy", List.Count)
in
    #"Pivoted Column"

Do you actually need this as a physical table in your model? If you need to see it as a visual, all you need is to create a measure using COUNT for the discount field and create a matrix with the customers as rows, the discount field as columns and the measure as values. So...

Count Discount = 
COUNT(fTable[Discount])