union of data sets in mdx

hi ,

I am using this MDX.

i have a date parameter.

i have to show the data in three sets.

  1. current month(201302)

  2. next six months from current months.(201203-201209)

  3. next six months form the last of 2 point(201309-201402)

so i tried this way.

SELECT   
     [Date].[Calendar].[Calendar YearMo].Members ON 0,   
     {[Sales Territory].[Sales Territory Country].[United States]} +  
     {[Sales Territory].[Sales Territory Country].[Canada]} ON 1   
FROM 
   [HCA_DW]
WHERE 
    (
		{[Measures].[Sales Amount]},
		{[Date].[Calendar].&[20130201] : [Date].[Calendar].&[20130131]}
	)

I am getting the data as ..

                           201201             201202               201203               201204  
United States   $7,652,625.30    $19,749,246.06    $22,909,628.84    $12,686,090.53  
Canada           $1,660,189.26     $5,444,601.58       $6,187,089.89     $3,063,889.72 

but I want to  more group as shown in the below pic.

what is the best way to do this using mdx.

Thanks in advance.