Hi clac
I'm sorry but it seems we missed your post...
Are you using the BOM stock control?
And are you using the Multi-Inventory add-on together with Product Levels?
Not sure if I understand what you want. You are mentioning that you would want to show the total inventory for the sub-assembly product in Stock Central but the BOM products aren't shown in Stock Central unless they are sellable. All the BOM products are shown in Manufacturing Central.
Best Regards,
Salva.