Hi Reena,
Please try below set of logics
Month=Substr(FormatNumber([SMM Realized Savings Month Code];"######");1;2)
Year=Substr(FormatNumber([SMM Realized Savings Month Code];"######");3;4)
Month=Left(FormatNumber([SMM Realized Savings Month Code];"######");2)
Year=Right(FormatNumber([SMM Realized Savings Month Code];"######");4)
Thanks
Mallik