MDX Query - Rolling Up A Case Statement

Hi,

I have the following query 

with
member measures.[EmployeeNumber] as [Employee].[EmployeeNumber].currentmember.member_name
member measures.[Type] as Case When [WorkDay].[DayOfWeek].currentmember.member_name = "Sunday" Then "PenaltyRate" Else "Standard" End
Select {
  measures.[EmployeeNumber]
, measures.[Type] 
, measures.[ContactHours]
} on 0,
non empty
[Employee].[EmployeeNumber].[all].children*
[WorkDay].[DayOfWeek].[all].children
Having measures.[ContactHours] <> 0
on 1
From MyCube

and I want write a MDX query that takes this result set and sums that ContactHours per EmployeeNumber and per Type i.e. excluding the WorkDay.DayOfWeek hierarchy from the results.

This would be the same as doing 

Select Sum(ContactHours), EmployeeNumber, Type
From ResultsSet
Group By EmployeeNumber, Type

in SQL.