Running Balance - Reset to Zero

Sample Data 

Here is link to the sample data

Hi Hinnantj ,

You can create two measures as below to get it, please find the details in the attachment.

Measure = 
VAR CurrentItem = SELECTEDVALUE ( 'Table'[Item] )
VAR CurrentDate = SELECTEDVALUE ( 'Table'[Month_Year] )
VAR BeginningBalance = CALCULATE (
    SUM ( 'Table'[Beginning Balance (1st Month Only)] ),
    ALLSELECTED ( 'Table' ),
    'Table'[Item] = CurrentItem
)
VAR MonthlyReduction = CALCULATE (
    SUM ( 'Table'[Monthly_Reduction] ),
    ALLSELECTED ( 'Table' ),
    'Table'[Item] = CurrentItem,
    'Table'[Month_Year] <= CurrentDate
)
VAR Production = CALCULATE (
    SUM ( 'Table'[Production_Planned] ) + SUM ( 'Table'[Production_Unplanned] ),
    ALLSELECTED ( 'Table' ),
    'Table'[Item] = CurrentItem,
    'Table'[Month_Year] <= CurrentDate
)
RETURN
    BeginningBalance - MonthlyReduction + Production  

Remaining_Balance = 
VAR CurrentItem = SELECTEDVALUE ( 'Table'[Item] )
VAR CurrentDate = SELECTEDVALUE ( 'Table'[Month_Year] )
VAR MaxZDate= CALCULATE(MAX('Table'[Month_Year]),FILTER(    ALLSELECTED ( 'Table' ),
    'Table'[Item] = CurrentItem&&[Measure]<0
))
VAR MonthlyReduction2=CALCULATE (
    SUM ( 'Table'[Monthly_Reduction] ),
    ALLSELECTED ( 'Table' ),
    'Table'[Item] = CurrentItem&&
    'Table'[Month_Year] >= MaxZDate&&'Table'[Month_Year] <=CurrentDate
)
VAR Production2 = CALCULATE (
    SUM ( 'Table'[Production_Planned] ) + SUM ( 'Table'[Production_Unplanned] ),
    ALLSELECTED ( 'Table' ),
    'Table'[Item] = CurrentItem&&
    'Table'[Month_Year] >= MaxZDate&&'Table'[Month_Year] <=CurrentDate
)
RETURN IF(NOT(ISBLANK(MaxZDate))&&CurrentDate>=MaxZDate,Production2-MonthlyReduction2,IF([Measure]<0,BLANK(),[Measure])) 

Best Regards