This is an entirely different question than your original question about retention of the priority date.
You are now asking about what qualifies for an EB2.
You will need to post that in a new question thread.
I will answer your question about withdrawal of petition because that is related to your first question.
.how expensive is it to withdrew i140.
It is free. It costs nothing to withdraw a petition.
how much wil be the attorney fee.
No lawyer is needed, it is just written in a letter and simply says "Please withdraw the petition".
how long it will take to withdrew i140.
No more than a month.
can i demand the comapny to have it withdrawn as i dont want to deal with the company anymore
Yes, you can demand the company to withdraw the petition but they do not have to do anything you demand of them.
The petition belongs to them and they can do anything they want with it.