Get value for previous month

Hi ApurvaKhatri

Add this calculated column

PreviousMonthCount =
VAR Previous_Month =
    MAXX (
        FILTER ( Table1, Table1[GroupingDate] < EARLIER ( Table1[GroupingDate] ) ),
        Table1[GroupingDate]
    )
RETURN
    CALCULATE (
        SUM ( Table1[GroupingCount] ),
        FILTER ( Table1, Table1[GroupingDate] = Previous_Month )
    )

Hi ApurvaKhatri

Alternatively, you could use a "MEASURE" as well

PreviousMonthCount =
VAR Previous_Month =
    MAXX (
        FILTER (
            ALL ( Table1 ),
            Table1[GroupingDate] < VALUES ( Table1[GroupingDate] )
        ),
        Table1[GroupingDate]
    )
RETURN
    IF (
        HASONEVALUE ( Table1[GroupingDate] ),
        CALCULATE (
            VALUES ( Table1[GroupingCount] ),
            FILTER ( ALL ( Table1 ), Table1[GroupingDate] = Previous_Month )
        )
    )