Connecting to a service which is installed with sub user name from different company:
1- What will do the company that installed the service? :
Right click the service icon at the bottom right of the computer where the service is installed and select "Add another company" from the drop-down menu..
The main user name of the other company is written in the form. Any password can be written to the password section. The other company must have a pro user right too.
More than one company can be added in this way.
2- The company that will connect to another company's service:
The other company informs me of the password after adding me to its service.
When the option is selected, all the companies and sub-user names that have been added me to the service will be displayed.
I select the desired service and press the "Connect" button and connect to this computer when I type the password given.