Or if you want it with the union:
DECLARE @test TABLE (Descr VARCHAR(MAX), Notes VARCHAR(MAX), Type VARCHAR(MAX));
INSERT @test VALUES
('My Description1', 'This is a test','A'),
('My Description2', 'Another test','B'),
('My DescriptionA', 'This is a testA','A'),
('My DescriptionB', 'Another testA','B');
select * from @test
SELECT
ROW_NUMBER() OVER (ORDER BY (SELECT 1)) AS RCounter,
*
FROM
(
SELECT
Descr, Notes
from @test
WHERE Type='A'
UNION
SELECT
Descr, Notes
from @test
WHERE Type = 'B'
) x