What is the best way to update a model that has a collection of nested entities?

Question

Entity Framework

Good afternoon.
What is the best way to update a model that has a collection of nested entities that can also change. For example, there is a department, it has a list of employees (Departments -> List). The user in the web form renamed the department, deleted several employees, added a couple of new ones. How to correctly and simply update all this. Simply assigning a value to the Employees field with a new collection will not work. You can update employees individually, and after updating them, update only the department fields. You can also compare the current and new collections, and manually add/remove new/remote workers. Maybe there is some other way, I just don't know about it?
How would you do?
Found a similar question. ( toster.ru/q/142339)There is just a variant with enumeration and incomplete, because it does not react to the removal of elements from the collection.