If we take as an example such a large and extensive business as the trade in building materials, then you need to contact all the companies involved in the construction of various objects.
Uma sicacisa isibonelo sebhizinisi elikhulu nelolukhulu njengezohwebo ezakhiweni zokwakha, khona-ke udinga ukuxhumana nazo zonke izinkampani ezithintekayo ekwakheni izinto ezihlukahlukene.