SSRS Specifc Sort Order

Hello,

I'm new to working with SQL, SSRS and Report Builder - Access is my area of experience.  In my first Tablix I need to set up quarters and then months in a specific order - August through July.
I've got everything working except when Q2 is expanded and it doesn't show the months in the order needed

+Q2
November

-Q2
January|November|December

Quarter code:

  ,Case 
	When DatePart(month,[Posting Date]) in (8,9,10) then 'Q1'
	When DatePart(month,[Posting Date]) in (11,12,1) then 'Q2'
	When DatePart(month,[Posting Date]) in (2,3,4) then 'Q3'
	Else 'Q4'
End As 'Quarter'

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Order by code:

ORDER BY (CASE WHEN 'MonthVal' = 2 THEN 0 
	When 'MonthVal' = 3 then 1
	When 'MonthVal' = 4 then 2
	When 'MonthVal' = 5 then 3
	When 'MonthVal' = 6 then 4
	When 'MonthVal' = 7 then 5
	When 'MonthVal' = 8 then 6
	When 'MonthVal' = 9 then 7
	When 'MonthVal' = 10 then 8
	When 'MonthVal' = 11 then 9
	When 'MonthVal' = 12 then 10
	When 'MonthVal' = 1 then 11 END)

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When I try to add the following code to Order by

,(CASE WHEN 'Month Name' LIKE 'February' then 0
	When 'Month Name' LIKE 'March' then 1
	When 'Month Name' LIKE 'April' then 2
	When 'Month Name' LIKE 'May' then 3
	When 'Month Name' LIKE 'June' then 4
	When 'Month Name' LIKE 'July' then 5
	When 'Month Name' LIKE 'August' then 6
	When 'Month Name' LIKE 'September' then 7
	When 'Month Name' LIKE 'October' then 8
	When 'Month Name' LIKE 'November' then 9
	When 'Month Name' LIKE 'December' then 10
	When 'Month Name' LIKE 'January' then 11 END)

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I get the following error: A constant expression was encountered in the ORDER BY list, position 2.

I know I should set this up as a function or something similar so I can reuse it, but I would like to get this working just for this first report.

Suggestions please...

Thank you.