If your company has multiple subsidiaries, you can assign people to workplaces based on their subsidiaries.
To assign an employee to a subsidiary (a workplace) go to Contacts > People.
Select the person you want to assign to a subsidiary and select Options > Edit Workplace.
Now you can select a workplace from the list of Subsidiaries:
Click Update when you're done. This might influence their capacity and availability, based on the country they are working in.