How to calculate Running Total from a summarized dataset with StartDate and MonthlySavings

[nexaframe]

Hello,

i have a very simple data-set but I am struggling extremly on how to tackle it.

I would like to calculate various measures but I am extremely struggling with all of them as the dataset is basically a summary and not a raw-data set with actual monthly values.

SampleData:

ID	ImplementationDate	MonthlySavings	MonthsSinceImplementation
1	15-Aug-22	10	6
2	20-Oct-22	15	4
3	12-Dec-22	5	2

I linked my dataset to a Date-Table.

And calculated: NewSavingsByDate=CALCULATE(SUM(Data[MonthlySavings]),USERELATIONSHIP('Calendar'[Date],Data[ImplementationDate]))

I also added a column: MonthsSinceImplementation = DATEDIFF(Data[ImplementationDate],TODAY(),MONTH)

With this I wanted to calculate the Total Savings = CALCULATE(SUM([MonthlySavings]*SUM([MonthsSinceImplementation].

This works per row, but not for the full data, as it then gives me "(10+15+5)*(6+4+2) = 360"

I tried with "ALLEXCEPT" filter on ID but this didn't change anything on the result.

Further Required Calculations:

Running Total Savings should look like this:

ID	Aug-22	Sep-22	Oct-22	Nov-22	Dec-22	Jan-23	Feb-23	TOTAL
1	0	10	10	10	10	10	10	60
2	0	0	0	15	15	15	15	60
3	0	0	0	0	0	5	5	10
TOTAL	0	10	10	25	25	30	30	130

Running accumulated Savings should look like this

ID	Aug-22	Sep-22	Oct-22	Nov-22	Dec-22	Jan-23	Feb-23	TOTAL
1	0	10	20	30	40	50	60	60
2	0	0	0	15	30	45	60	60
3	0	0	0	0	0	5	10	10
TOTAL	0	10	20	45	70	100	130	130

I hope someone could lead me to the right direction...

Thanks in advance!