How to create a sum measure with specific conditions

[red_arrowhead]

I have data divided into calander weeks. I have a few identifiers and their values divided into columns of calender weeks which are  created from dates and relationships with calender weeks. 

Now I want to have a visual with can showthe sum of first 5 identifiers together into all calender weeks and another row with sum of last 2 identifiers together into all calender weeks. 

How can I do it?

Example 

Here I want sum of all values of A,B,C,D together in those seperate CW

and sum of E,F into another row seperated into CW

[amitchandak · Accepted solution]

@red_arrowhead , Not very clear. You have to create a new column like this and use that

Switch(True(),
[identifier] in {"A","B","C", "D"} , "Cat1",
[identifier] in {"E", "F"},"Cat2"
)