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, or to Settings > Users.

Select the person you want to assign to a subsidiary and click on the three vertical dots icon > Edit Workplace. 

Now you can select a workplace from the list of Subsidiaries:

Click Update person when you're done. This might influence their capacity and availability, based on the country they are working in.