How to show summarized data dynamically

POSPOS 

output : 

check solution below :

step 1 : 

create a config table : 

step 2 : 

create the following measures : 

phase 1 = 
SUMX(
    scatter,
    DATEDIFF(scatter[start date] , scatter[step1] , day)
)



phase 2 = 
SUMX(
    scatter,
    DATEDIFF(scatter[step1] , scatter[step2] , day)
)



phase 3 = 
SUMX(
    scatter,
    DATEDIFF(scatter[step2] , scatter[final date] , day)
)





all phases = 
SWITCH(
    TRUE(),
    SELECTEDVALUE(config_tbl[days_for]) = "days for phase 1" ,[phase 1],
    SELECTEDVALUE(config_tbl[days_for]) = "days for phase 2" ,[phase 2],
    SELECTEDVALUE(config_tbl[days_for]) = "days for phase 3" ,[phase 3]
)

\

last step : 

drag and drop to the visual :

output : 

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POSPOS 

change your code as below :check image .