Power Query Group by Year Month

Hello,

Is there a way to group by Year Month combination and still keep as a number format so it will act as in index

I've transformed the date column to ;

Table.TransformColumns(  Source, {"Date", 
 each  Number.From( Text.From(Date.Year(_)) &   Text.PadStart( Text.From( Date.Month(_)),2,"0")) } )

Which does work, the only other way I can think is to transform each date to the start of the month but I would raelly like to keep
a MM - YYYY format , any ideas,


Richard.

Just to add I fount rick de groots article with all the text formats, so thanks, I had not known about this and would not have looked for it without your reply.