BOM

Hi,

I am creating the BOM for my project. I want the Header Item and, the subitems are the spares parts required for the header Item(Spare parts are the one that are required for the annual maintainenece of header item). Now in the sales order

whenever i enter the header item the spare parts should come as subitem . Here the additional requirements are

1. Billing and delivery should happen at header level

2. Only delivery should happen to subitems(Billing should not be there for subitems).

what are the configuration settings that should i do?

Thanks