Running Sum

Hi ChristianPower , here is pic

Let me know if you have any questions.

If this solves your issues, please mark it as the solution, so that others can find it easily. Kudos 👍are nice too.
Nathaniel

Hi ChristianPower , Try this

RT =
VAR _getRang =
    MAX ( myTable[Rang] )
VAR _calc =
    CALCULATE (
        SUM ( myTable[PofTotal col] ),
        FILTER ( ALL ( myTable ), myTable[Rang] <= _getRang )
    )
RETURN
    _calc

Let me know if you have any questions.

If this solves your issues, please mark it as the solution, so that others can find it easily. Kudos 👍are nice too.
Nathaniel

Hi, you have missed out FILTER function.

Try write something like: 
CALCULATE(SUM(Spend Tail Analysis[PercentageOfTotal],
FILTER(ALL(Spend Tail Analysis), Spend Tail Analysis[Rang] <= MAX(Spend Tail Analysis[Rang]))

If this solution works for you, please mark it as solution to allow other searching members easily find solutions.

Hi ChristianPower 

Here is something close

running total in Date =
CALCULATE(
[Sales Amount],
FILTER(
ALLSELECTED('Calendar'[Date]),
ISONORAFTER('Calendar'[Date], MAX('Calendar'[Date]), DESC)
)
)

Replace [Sales Amount] by your "Percentage of totalt" and "'Calendar'[Date]" by your Rank column