Rank Selection Branches and Sub Branches

Hello mohammedkhan 

You can skip the ranking and use TOPN with your ranking measure to get your TOPN games.  It would look something like this.

Top N Game Income =
VAR _Ranks =
    SELECTEDVALUE ( Ranks[Rank] )
VAR _RankingContext =
    VALUES ( 'Game Income'[Games] )
RETURN
    CALCULATE (
        [Total Game Income],
        TOPN ( _Ranks, ALL ( 'Game Income'[Games] ), [Total Game Income] ),
        _RankingContext
    )

Take a look at this video for more information on the example.

https://www.youtube.com/watch?v=bbM7JSQqn2I

The problem you are running into is your ALL ( 'Games Income' ) is bringing the whole table, not just all the games.  What you want is this.

Game Rank = 
IF ( 
    NOT ISINSCOPE ( 'Game Income'[Games] ), BLANK(),
    RANKX ( ALL ( 'Game Income'[Games] ), [Total Game Income] )
)

And if you want the rank only on the TopN games you can use this.

TopN Game Rank = 
IF ( 
    ISBLANK ( [Top N Game Income] ) || NOT ISINSCOPE ( 'Game Income'[Games] ), BLANK(),
    RANKX ( ALL ( 'Game Income'[Games] ), [Top N Game Income] )
)