@Unity BzSoft I see , i thought that the cutting of the plane was relative to the shape. Thank you for your support.

Problem in a video @Unity BzSoft : https://drive.google.com/file/d/1BKaUpDAAMQCoB1JEl2nwqC2qy2y1Bg9o/view?usp=sharing

I will send you a video in this forum with the steps i made from A to Z , so everyone else can get the benefit.