Customer Hierarchy - Structure between Hierarchy Levels?

Hi -

I have a situation where my simple three node customer hierarchy is

                          Parent Company (Node1) -> Child Company (Node 2) -> SubContractor (Node 3)

My data is

SubContractor S1, S2, S3, S4 are child nodes only to Child Company C1

SubContractor S5, S6, S7 are child nodes only to Child Company C2

Is there a way I can represent this using the three node hierarchy or do I need to have five nodes

                    Parent Company (Node 1) -> Child Company (Node 2, Node 3) -> SubContractor (Node 4, Node 5)

Thanks in advance for the time.

Regards