Build a box filling system in Factory IO with Tia Portal

I want the system to operate with three buttons (start, stop, and emergency stop). I want to input the number of boxes to be filled, the number of the blue material that will go into the box, then start the operation. when the two sensors detect a box, I want the filling process to start. other process for stop and emergency stop should be satisfied as well. also, when the number of boxes to be filled is satisfied, the system should stop.