If a user at your company should have access to a test system you could do the following:

1. Navigate to the USERS application in your production system.

2. Search for the user that should have access to a new system. 

3. Select the Systems tab.

4. Choose the option "Add system permission" and select the system that the user should have access to, together with the company. The final step will be to write a reason for the new permission. 

When all information is added, click the Add permission button. 

5. The user will have access to the system when starting a new session (log out/in).