myLastMonthYears ="2019-02"
myLastMonthYears1 = myLastMonthYears & " TOTAL"
myLastMonthYears2 = myLastMonthYears & " $ Final max"
ActiveSheet.PivotTables("pvt1").CalculatedFiCalculatedFields.Addelds.Add "$inv - $max", "='" & myLastMonthYears1 & "'-'" & myLastMonthYears2 & "'", True