Month Custom Column

use this formula:

Text.Start(Date.MonthName([Date]), 3) & "-" & Text.End(Text.From(Date.Year([Date])), 2)

It returns this. You just need to set the column type to Text when done jcastr02 

Hello jcastr02 

you can use the formula Date.ToText like this

Date.ToText([Date],"MMM-yy")

Here the complete example

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjTVMzDUMzJQitWBcwyVYmMB", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Date = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Date", type date}}, "de-DE"),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "MMM-yy", each Date.ToText([Date],"MMM-yy"))
in
    #"Added Custom"

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

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Have fun

Jimmy