Company is not aligned with Company Departments .

[zeeshanA265]

One company can have many departments and one department can also be in many companies.
There is possibility that one company may have all the departments but other company may have some of the departments and some may not.
So, when I select one company only related departments must be available against the selected company ...
Still, We can use this scenario by using domain but there must be a valid relationship between company and company departments.
(e.g, roles , permission etc )