Question about Rankx in Matrix table format

Hi leilei787 
Here is the sample file with the solution https://www.dropbox.com/t/ic5uywEC976ZR0zm

You need to create two columns. 

Total Amount = 
VAR CurrentCode = 'Table'[PrimaryGeoCode_c]
VAR CurrentCodeTable =
    FILTER (
        'Table',
        'Table'[PrimaryGeoCode_c] = CurrentCode
    )
VAR Results =
    SUMX (
        CurrentCodeTable,
        'Table'[ShippedUSDAmountNet]
    )
RETURN
    Results 

Ranking = 
    RANKX (
        'Table',
        'Table'[Total Amount],
        , 
        DESC, 
        Dense 
    )

Then create your measure

Shipping Net = 
    SUM ('Table'[ShippedUSDAmountNet] )

I hope this satisfies your requirement. If so please consider marking this reply as "Accepted" solution. Thank you!