material where used list

I have 1 material that is Material BOM of another Material.

Means Like below situation

functional Location

|

Sub Functional Location

|

Material 1                  (4 Quantity)

|

Material 2                  (2 Quantity in each material 1 so total 8 Quantity)

here i want to see material where used list from cs15 for Material 2 so it shows 2 Quantity but I want total Quantity means it will have to show 8 quantity.

Pl. do the needful.