Anne I think you're looking for the exact equivalent of "outsourcing" there's no such direct translation into Spanish, but to explain the whole idea "contratación de servicios externos para llevar a cabo los procesos de negocios".
As I answer you on your previous thread about this very same question,
they are the "
Fabricante(s)", while you are the
Producer, I meant the "Productor(a)". There's no need of any further explanation if you clearly identify yourself as the producer only.
Here,
Producir 7. tr.
Econ. Crear cosas o servicios con valor económico.
Fabricar 1. tr. Producir objetos en serie, generalmente por medios mecánicos.