Replace numeric values with NULL in power query

Hello Damian89 

the simplest way to remove numbers is to use Text.Remove and indicating 0 - 9 in the second parameter

Text.Remove(text,{"0".."9"})

Here a complete example where I included this function into a Table.TranformColumns. You can also create a new column.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("Pcy7CQAhEATQVpaNjY792IsYCLqBXiZcaTZgY6cGZjOPYULAOXrLVh2knm2OxkKQNr5LiTC6gMIkJPDsSU+WD+7ivedbipUPllxQPVFVmfn8Y4w/", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Table1 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Table1", type text}}),
    GetRidOfNumber = Table.TransformColumns
    (
        #"Changed Type",
        {
            {
                "Table1",
                (text)=> Text.Remove(text,{"0".."9"})
            }
        }
    )
in
    GetRidOfNumber

Copy paste this code to the advanced editor in a new blank query to see how the solution works.

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Kudoes are nice too

Have fun

Jimmy