[Dev] How to build openEuler.iso image from ground?

Hi,

I am trying to crop openEuler iso. So I need to know how to build openEuler iso from the ground. Is it open source and possible?

Yours, Walter

--- 你好， 我是一名来自中国广州的软件工程师，我想对欧拉系统进行部分裁切，我以为这么做的前置条件是知道iso的构建方式，请问我从哪里可以获得帮助呢？ 谢谢。