Data Grid View Design in C# windows form

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C#

Hi All,
I am using DataGridView at runtime in C# windows form, my DataGridView displaying data
like below

rack   1   2   3   4   5   6
A1     20  30      40      20
A2     10      20      30  12
A3         24      22      15
B1     12  34  22      67     
B2     11          22      14
B3         24      22      15
C1         14      15      16
C2     34  55          35  25   

now the DataGridView should display like below

     rack   1   2   3   4   5   6
     A1     20  30      40      20
 A   A2     10      20      30  12
     A3         24      22      15

     B1     12  34  22      67     
 B   B2     11          22      14
     B3         24      22      15

     C1         14      15      16
 C   C2     34  55          35  25  

If possible please help
Thanks to All