Replace Number by text

Hi ana_cordeiro ,

To create a custom column as below.

Date.MonthName(#datetime(2011, [monthno], 1, 5, 0, 0), "en-US")

M code for your reference.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlSK1YlWMgKTxmDSBEyagkkzMGkOJi3ApCWYNDSAUBDdhkDtsQA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [monthno = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"monthno", Int64.Type}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each Date.MonthName(#datetime(2011, [monthno], 1, 5, 0, 0), "en-US"))
in
    #"Added Custom"