Also another way is:
you can subscribe for the time you need for additional company : 5 pounds/month. Create second TEST company in your database, export data from current, and import to that TEST company.
What it means, you will have a clone of your system, where your future employees can play around and learn. Only con for this price is 1 user at a time, it means only one employee can access that test company. When he/she leaves, another can access it. But for training it's enough.
Best regards,
Hansaworld support