Hello Antonio,
I feel the functionality you require for this Process is a combination of Third party order fulfilment Sub-Contracting Process, Unfortunately Sub-contracting is not support in ByD.
We have a similar requirement in our process but in our case the Processing is done by fixed Processing companies so we have had to create them as Internal Warehouses to accomplish Logistics movement and use Production (Please also note Third Party Warehouse in ByD does not support Production).
The Option is a Long-Winded Process of Production in the absence of Sub-contracting to consume the materials/raw material purchased and consumed by second supplier to produce New End Product which is then supplied to the Customer.
I hope this is helps.
Best regards
Nick