Custom Item kit - Sales order VS Package

Custom Item kit - Sales order VS Package

Greetings,

We are a compagny which sales GPS.
According to the type of Vehicle (Brand, model, year), our GPS is composed of differents items.

In other words, we can sell:
GPS 1 =
- composed of item 1, item 5, item 7 for vehicle A
- composed of Item 3, item 6, item 7 for vehicule B

GPS 2 =
- composed of item 2, item 5, item 7 for  vehicle A
- composed of Item 4, item 6, item 8 for  vehicule B

- On our Sales Order and Invoice, we want to show to client " GPS 1" or " GPS 2"
- but for our internal stock, we need to see the detail of each Item.

We can't create Item Bundle, because there is almost an infinite number of combinaison.
(We have 40 items, which can all be mixed).

So ho should we proceed ?

Thanks,

Claire