Running Total based on category

Anonymous, try this:

1. Create a table ProductMaster. Sort the Product column by the Index column (controls the sorting in the table visual). 

2. Join ProductMaster to the data table.

3. Create measures.

Total Cost = SUM ( ProductCost[Cost] )

Running Total = 
VAR vSelProd =
    SELECTEDVALUE ( ProductMaster[Index] )
VAR vResult =
    CALCULATE (
        [Total Cost],
        ProductMaster[Index] <= vSelProd,
        ALL ( ProductMaster[Product] )
    )
RETURN
    vResult

4. Create a table visual, using ProductMaster[Product] and the measures.

5. Result:

Hi Anonymous 

what about the following solution:

Sum of Cost = SUM(Data[Cost])

Running Total = 
CALCULATE(
    [Sum of Cost],
    FILTER(
        ALL(Data),
        MIN(Data[Product]) <= Data[Product]
    )
)

With kind regards from the town where the legend of the 'Pied Piper of Hamelin' is at home
FrankAT (Proud to be a Datanaut)