NESTED LOOP IN ABAP

Hi experts

Can we print BOM components in the following form .

Level1 Component1 Level2 comp1 Level3 comp1 Level4 comp1

Level1 Component1 Level2 comp1 Level3 comp2 Level4 comp1

Level1 Component2 Level2 comp2 Level3 comp1

Level1 Component3

Level1 Component4

and can anyone give me the logic for printing this form.

Thanks in advance.

Regards

Rajaram