Bom scenario to explode in sales order

hi , i have 1)main material KMAT type

2)next material KMAT type ( its the component)

both materials have classes config chars....

now , maintain BOM for 1 where 2nd item is bom item for it.

now when i create sales order for 1 it should explode and should give all options for both 1 and 2 materials

thanks

mmn

rewards for sure