Running total values and value for future periods

Hi nicoenz ,

Thanks for reaching out to us with your problem. Base on your description, it seems that you want to get the running total for the future dates. You can follow the steps to get it:

1. Create a separated date dimension table(DO NOT create any relationship with your fact table)

2. Apply the date field of date dimension table on X-axis of your line chart

3. Update the formula of measure [Running total] as below

Running total =
VAR Turro =
    CALCULATE (
        SUM ( 'Table'[Volume] ),
        FILTER (
            ALLSELECTED ( 'Table' ),
            'Table'[Fiscal year/period] = SELECTEDVALUE ( 'Date'[Date] )
        ),
        FILTER (
            ALLSELECTED ( 'Table' ),
            'Table'[WorkDayPeriod] <= SELECTEDVALUE ( 'Date'[Date] )
        )
    )
RETURN
    IF (
        Turro <> 0,
        Turro,
        Turro
            + CALCULATE ( SUM ( 'Table'[Volume] ), REMOVEFILTERS ( 'Table'[WorkDayPeriod] ) )
    )

If the above one can't help you get the expected result, please provide some raw data in your table (exclude sensitive data) with Text format, your line chart Fields settings and your expected result with special examples and screenshots. It would be helpful to find out the solution. You can refer the following link to share the required info:

How to provide sample data in the Power BI Forum

And It is better if you can share a simplified pbix file. You can refer the following link to upload the file to the community. Thank you.

How to upload PBI in Community

Best Regards