Convert table help

Hi all,

I have the following table which I need to convert
DECLARE @Class TABLE
(
  ID int,
  Line1 int,
  Line1Percentage int,
  Line2 int,
  Line2Percentage int,
  Line3 int,
  Line3Percentage int
 
)
 
 INSERT INTO @Class
 VALUES (1, 2, 100, NULL, NULL, NULL, NULL)
 , (2, 22, 100, NULL, NULL, NULL, NULL)
 , (3, 5, 50, 7, 50, NULL, NULL)
 , (4, 25, 50, 7, 40, 2, 10)
 
 SELECT * FROM @Class
 
ID Line1 Line1Percentage Line2  Line2Percentage Line3  Line3Percentage
1   2       100                   NULL  NULL                NULL  NULL
2   22     100                   NULL  NULL                 NULL   NULL
3   5       50                    7        50                    NULL   NULL
4  25      50                    7        40                     2        10

I need it to return the following: Line column will have the combination of Line1, Line2 and Line3
Perentage will have the Line1Percentage, Line2Percentage, Line3Percentage. I would like my table not to return any nulls.

ID Line Percentage
1  2    100
2  22   100
3  5    50
3  7    50
4  25   50
4  7    40
4  2    10

Is this possible?