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Hi akhassim please create measure as below Cumulative test.

If you do not have already Calendar / Date table, create one using link as instruction below

Cumulative test =
VAR __max_date = MAX ( 'Date'[Date] ) -- your Date table
RETURN
CALCULATE (
SUM(Cost Actual)],
'Date'[Date] <= __max_date,
ALL ( Date )
)

Create Calendar Table Microsoft Learn

https://learn.microsoft.com/en-us/power-bi/guidance/model-date-tables

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