Need Measure to Partially Ignore Slicer Filter

After working on this off and on for a few days and doing a fair bit of testing, I was able to come with a solution that works. Thank you to everyone who offered suggestions. Working measure is below.

test4 = 
VAR MaxDate = MAX(Dates[Date])
VAR MinDate = MIN(Dates[Date])
Var MaxTime = CALCULATE(SUM('Time Entries'[Billable_Amt]),'Time Entries'[Included In Billable Hours], ALL(Dates))
Var PeriodTime = CALCULATE(SUM('Time Entries'[Billable_Amt]),'Time Entries'[Included In Billable Hours], FILTER(Dates, Dates[Date] <= MaxDate && Dates[Date] >= MinDate))
Var ThroughPeriodTime = CALCULATE(SUM('Time Entries'[Billable_Amt]),'Time Entries'[Included In Billable Hours], FILTER(ALL(Dates), Dates[Date] <= MaxDate))
Var SincePeriodTime = CALCULATE(SUM('Time Entries'[Billable_Amt]),'Time Entries'[Included In Billable Hours], FILTER(ALL(Dates), Dates[Date] > MaxDate))
Var BeforePeriodTime = CALCULATE(SUM('Time Entries'[Billable_Amt]),'Time Entries'[Included In Billable Hours], FILTER(ALL(Dates), Dates[Date] < MinDate))
VAR BillingAmount = SUM(Projects[Billing_Amount])
RETURN
IF(ThroughPeriodTime < SUM(Projects[Billing_Amount]) && (HASONEFILTER(Dates[Week]) || HASONEFILTER(Dates[Month])), PeriodTime, 
    IF(BeforePeriodTime < SUM(Projects[Billing_Amount]) && (HASONEFILTER(Dates[Week]) || HASONEFILTER(Dates[Month])), BillingAmount-BeforePeriodTime, 
        IF(ThroughPeriodTime < SUM(Projects[Billing_Amount]), PeriodTime,
            IF(BeforePeriodTime < SUM(Projects[Billing_Amount]), BillingAmount-BeforePeriodTime,
                IF(BeforePeriodTime > SUM(Projects[Billing_Amount]) && (HASONEFILTER(Dates[Week]) || HASONEFILTER(Dates[Month])), 0,
                    IF(BeforePeriodTime > SUM(Projects[Billing_Amount]), BillingAmount,0
                    )
                )
            )
        )
    )    
)