METADATA|AssignedPayroll|AssignmentNumber|LegislativeDataGroupName|PayrollDefinitionCode|StartDate|CloseDate|EffectiveStartDate|EffectiveEndDate
MERGE|AssignedPayroll|E1001|US Legislative Data Group|Semi Monthly|2021/01/05|2021/03/31 00:00:00|2021/01/05|2021/03/31
MERGE|AssignedPayroll|E1002|US Legislative Data Group|Semi Monthly|2021/01/05|2021/03/31 00:00:00|2021/01/05|
Close Date should be passed in the format - yyyy/mm/dd hh24:mi:ss. Otherwise error will be thrown.
Effective End Date if left blank also works the same way in above case as I did for the second employee above.