How to multiply by grouping rows in dax?

[Anonymous]

I have a dataset grouped by two rows as below

GroupName    Score   Multiply
Group1        2      
Group2        3
Group2        5
Group1        1

I have a slicer based on the parameter table for storing the above GroupName values. so when I select Group1( I am using a selected function on variable in my dax) I want to multiply all rows for Group1(scores) by 4 and all rows for Group2(score) by 6.

I tried this but it is updating all rows.

var a=4*score
var b=6*score
var mm=selectedvalue('Group Paramter'[Group Name])

Return if( mm ="Group1", a, b)

But it multiplies all rows, how can I multiply by grouping using GroupName?

How can I achieve this? I apperciate for any help.

[V-lianl-msft · Accepted solution]

Please try:

measure = 
var SCORE = SUMX('Table','Table'[Score])
return SWITCH(TRUE(),
SELECTEDVALUE('Table'[GroupName])="G1",SCORE*4,
SELECTEDVALUE('Table'[GroupName])="G2",SCORE*6)

[amitchandak]

@Anonymous , You can nor create a new column based on slicer value , You need to create a measure 

measure =var mm= if(selectedvalue('Group Paramter'[Group Name])="Group1", 4,6)
return
sumx(Table, [Score]*mm)

or

measure  =

var mm= if(selectedvalue('Group Paramter'[Group Name])="Group1", 4,6)
return
sum( [Score])*mm)