To add a business unit for a Company Client, head over to the Client Card, Details-view, under the Business Unit section.
Click on the field and enter the business unit name you want.
Click anywhere in the empty space, and the changes will be saved automatically.
1. Ensure that you are either a Case Manager, a Client Manager, a User with 'Assistant'-role, or a User with 'Administrator'-rights set up to be able to make changes.