Cumulative Totals by Group plus manipulation

Hi AUGUSF,

Do you want a table like it below? If so, you can try it in this file. 

1. A new table of new mapping pairs. (Simple in my test)

NewMapping =
CROSSJOIN (
    VALUES ( Table1[Time] ),
    { "C1", "C2", "C3", "C4", "C5", "C6", "C7", "C8" }
)

2. A bridge table.

Time = VALUES(Table1[Time])

3. Establish relationships.

4. Use a measure like below. (these two have same functions.)

Measure 2 =
VAR newRule =
    MIN ( 'NewMapping'[NewRule] )
RETURN
    SWITCH (
        newRule,
        "C1", CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "A" ),
        "C2", CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "B" )
            - CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "C" ),
        "C3", CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "C" ),
        "C4", CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "D" ),
        "C5", CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "E" ),
        "C6", CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "F" )
            - CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "G" )
            - CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "E" )
            - CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "D" ),
        "C7", CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "G" ),
        "C8", CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "A" )
            - CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "B" )
            - CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "F" )
    )

Measure =
VAR newRule =
    MIN ( 'NewMapping'[NewRule] )
RETURN
    IF (
        newRule = "C1",
        CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "A" ),
        IF (
            newRule = "C2",
            CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "B" )
                - CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "C" ),
            IF (
                newRule = "C3",
                CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "C" ),
                IF (
                    newRule = "C4",
                    CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "D" ),
                    IF (
                        newRule = "C5",
                        CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "E" ),
                        IF (
                            newRule = "C6",
                            CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "F" )
                                - CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "G" )
                                - CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "E" )
                                - CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "D" ),
                            IF (
                                newRule = "C7",
                                CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "G" ),
                                IF (
                                    newRule = "C8",
                                    CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "A" )
                                        - CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "B" )
                                        - CALCULATE ( SUM ( Table1[Value] ), 'Table1'[Meter] = "F" )
                                )
                            )
                        )
                    )
                )
            )
        )
    )

Best Regards,

Dale