Multiple Logins Per Email Address

Hi, i'm looking at setting up a customer 'portal' site with nop so that one person can place orders for a number of different companies, each company has access to a different amount of products and at varying prices etc. so each account holder needs multiple logins.

I've activated username control to see if I can create more than one login with the same email address, but can't find a way of doing it.

Has anyone come across this and worked it out previously?

We have a similar requirement. Are there any thoughts on this?

Why not just use the built-in "Impersonate" feature? It allows your staff to click into that customer's account and "impersonate" them for a purchase session. You can put different customers into different customer "roles"..and provide discounts based on those roles. It will just require that you create a new customer via the admin system first.