@SQL = SELECT	bla
	FROM Table.....


IF( @Index > 2 )
BEGIN
        @SQL = SELECT	bla
	FROM Table.....
END


IF( @Index > 3 )
BEGIN
        @SQL = SELECT	bla
	FROM Table.....
END


IF( @Index > 4 )
BEGIN
        @SQL = SELECT	bla
	FROM Table.....
END