Adding items from subassembly (that also have subassemblies)

[Simon4]

Hi all,

I have an intresting case:

I have to obtain all the items that are in a assembly list ( to calculate costprice). 

unfortunatly my assembly list does not only have articles, but also other assembly list, which also have assembly lists..

I found assembly list that have 5 layers. 

How do I produce a list of all the items in the main assembly list with the right quantities?

Here is some code I use now, which does not work:

I need something like this:

items (and quantity) from assembly + items (and quantity) from subassembly + items (and quantity) from subassembly+ items (and quantity) from subassembly

I understand if this all sounds a bit vague, ask quesitons if you need more information please.