DAX for Slicer Selection Values

Hi RENJITH_R_S 

Try this measure

Selected Periods = 
VAR SelectedYears = VALUES('Date'[Fiscal Year])
VAR SelectedQuarters = VALUES('Date'[Fiscal Quarter Year])

-- Table: Year and number of selected quarters in that year
VAR QuarterCountsPerYear =
    SUMMARIZE(
        'Date',
        'Date'[Fiscal Year],
        "SelectedQuarterCount",
            CALCULATE(
                DISTINCTCOUNT('Date'[Fiscal Quarter Year])
            )
    )

-- Filter to get only years where 4 quarters are selected
VAR FullYears =
    SELECTCOLUMNS(
        FILTER(QuarterCountsPerYear, [SelectedQuarterCount] = 4),
        "Fiscal Year", [Fiscal Year]
    )

-- Quarters NOT part of full selected years
VAR QuartersToShow =
    EXCEPT(
        SelectedQuarters,
        SELECTCOLUMNS(
            FILTER('Date', 'Date'[Fiscal Year] IN FullYears),
            "Fiscal Quarter Year", 'Date'[Fiscal Quarter Year]
        )
    )

-- Combine into final display strings
VAR DisplayYears =
    CONCATENATEX(FullYears, [Fiscal Year], ", ")

VAR DisplayQuarters =
    CONCATENATEX(QuartersToShow, [Fiscal Quarter Year], ", ")

RETURN
TRIM(
    DisplayYears &
    IF(DisplayYears <> "" && DisplayQuarters <> "", ", ", "") &
    DisplayQuarters
)