Is that meeting of a continuous improvement project may contain the operators? or at least one of their representative?

Sure, but it's not necessary to let them attend all meetings, but you will need their input because they have hands-on and know details about real work, and they will help you to understand the as-it-is process.

There should be a separate meeting for all the operators together and based on the outcome their representative shall discuss further with the continuous improvement department.

wait expert answers for details

Thanks for the invite, I apologize for the answer, I do not know, I leave the answer to the specialists.