Cumulative base on 3 column

Hi AllanBerces 

 Try this

Cumulative_Trade = 
CALCULATE(
    SUM('YourTable'[Weekly_Pl]),
    FILTER(
        ALL('YourTable'),
        'YourTable'[Area] = EARLIER('YourTable'[Area]) &&
        'YourTable'[Trade] = EARLIER('YourTable'[Trade]) &&
        'YourTable'[Week No.] <= EARLIER('YourTable'[Week No.])
    )
)

Hope this helps, please give a thumbs up and mark as solved if it does, thanks!

Hi AllanBerces 

Cum_Trade =
var CurrentArea = [Area]
var CurrentWeek = [Week No.]

var Trade = [Trade]

Return
Calculate(
Sum(table[Weekly Plan])

 ,table[Area] = CurrentArea
,table[Week No.] <=  CurrentWeek

table [Trade] = Trade
)

Capture the current filters into variables and then ask it to sum the target column after adding some filters.