Serial Number / Customer equipment card capabilities

Question

Material Structure for Sales BOM  - Item A
Item A = sales Item only, Non inventory, not purchases.  The item comprises of
1 x Item B (serialised item on every transaction, and automatic customer equipment card creation).
1 x Item C (serialised item on every transaction, and automatic customer equipment card creation).
Item A for example is a box (which is not serialised), but Item B and C are components of A.  And it needs to be tracked that B and C belong to a specific/ unique A. That is, if we drill into the customer equipment card, how can we see that item B and C  are related to the parent item A (without drilling into the document from the equipment card). 
When an delivery/AR invoice is created, customer equipment cards are automatically generated for Item B and C.  How can this be linked to A?

Answer 1

Great idea.
How can we also, create a unique reference for each time A is sold?  So that if a part B is returned and a new part  B replaced, the part can be linked to unique A?
The reason for the requirement is that a client may purchase 2 A's (not serilaised A), and we want to track which B's and which C's relate to which A's. And if a B is replaced and another B, we want to track which A it related to.
Thanks