Explosion of BOM after creating Sales Order BOM

Dear Experts,

I am a SD guy , I need to setup Sales order BOM and following steps i have done so far-

1. Created a Sales Order Order with header material and saved.
2. Created "Sales order BOM" by t-code CS61 for this Sales order and item.

Now if i go back to sales order , how can i explode BOM which i created above.

Thanks.