Mother class modification propagation

Hello,

I would like to know how is propagated modifications done in mother class in the child class; I explain:

I do a mother class implementating a state diagram for my application. All my device classes will inherit this mother class.
If I update the mother class, for example

  • adding a state
  • or modififying a state transition
    is this/these modifications propagated to my child classes?

If no, this means, that I have to update manually?
If yes, is it done automatically, or by regenerating the device class …
What is the procedure?

Thanks by advance,
Laurence.