Multiple organizations and users under one account

Multiple organizations and users under one account

Hi, I'm considering to offer a billing platform to my clients.
I need to know if, having a subscription to Professional Invoice, I will be able to:

1. create an organization for each of my clients (unlimited?)
2. create users and assign them exclusively to their organization

I'm currently trying out a free account with which I have not the opportunity to test the functionality of assigning users to organizations.

Michele