Comma Delimited Processing

Suppose I have a table named Test (referred in the query below)

Category Indicators
ctgy1Y,,,,
ctgy2Y,Y,Y,N,
ctgy3,Y,,Y,

and If I would like to transform this table to

Category Indicators
ctgy1Y
ctgy2Y
ctgy2Y
ctgy2Y
ctgy3Y
ctgy3Y

I am able to do it using the logic below

CREATE TABLE dbo.Numbers (Number INT IDENTITY(1,1) PRIMARY KEY CLUSTERED)
WHILE COALESCE(SCOPE_IDENTITY(), 0) < 5
BEGIN
INSERT dbo.Numbers DEFAULT VALUES
END

SELECT category,
SUBSTRING( Value, Number, CHARINDEX( ',', Value + ',', Number ) - Number ) as program
FROM Test
inner
JOIN Numbers
ON SUBSTRING( ',' + Value, Number, 1 ) = ','
and CHARINDEX( ',', Value+',', Number ) - Number <> 0
where Number <= Len(Value) + 1

But I would like to Transform this table into something like the one below (where if 'Y' before 1st comma then Q1, if 'Y' Before 2nd comma then Q2 and so on

Category Indicators
ctgy1Q1
ctgy2Q1
ctgy2Q2
ctgy2Q3
ctgy3Q2
ctgy3Q4

What is the best and efficient way to obtain this? Any help will be greatly helpful.


Thanks
Ram