Customer access to subcustomer

Hi all,

I'm hoping someone here will be able to shed some light on this for me.  I'm currently in the process of setting an NS site up for someone, all has been going well generally, except for this one sticking point which seems to have baffled me.

Here's our senario;
We have a customer with a number of employees, they order their corporate uniform off of us.
What we would like to happen is that the lady in HR be able to do most of the ordering (if not all) but we would like to keep their employees details on the system to make re-ordering a lot faster.  So far we have the company setup as a customer and the lady in HR is the primary contact, we then have all of the employees setup as subcustomers (with the clothes sizes stored along with those records).