Is this what you want?
DECLARE @tv1 TABLE (
col_A varchar(10),
col_B varchar(10),
col_C int
)
INSERT INTO @tv1
SELECT '123' ,'RED', 4 UNION ALL
SELECT '234' ,'BLUE', 2 UNION ALL
SELECT '123' ,'RED', 7 UNION ALL
SELECT '345' ,'GREEN', 1 UNION ALL
SELECT...