Hi peteroznewman, 


Thank you for your explanation, that works!

But if I want to divide my beam with trapezoid profile into 3 parts (like below picture). Since I would like to apply 2 fix supports at the bottom of the beam (place 1 and 2), and apply two pressure on the top of the beam (place 3 and 4). Do you know how can I do that with the method of extract?


Thank you and hope you have a great day!