根据这个帖子说：
http://web.wenxuecity.com/BBSAdd.php?SubID=immigration
Q:Must the alien have a new offer of employment at the time the I-485 is being adjudicated under the I-140 portability provisions?
Answer: Yes. The alien cannot still be looking for “same or similar” employment at the time the I-485 is being adjudicated under the adjustment portability provisions. The alien must be able to show there is a new valid offer of employment at the time the I-485 is adjudicated.
这里只说申请人需要有一个“JobOffer",并没有说要有PayStub什么的。那么是不是只要有公司愿意给出一个OfferＬｅｔｔｅｒ 就可以了呢？
另外在这个Ｍｅｍｏ的问题８和９中写明ＳｅｌｆEmployment 也可以，那么是否本人现在成立一个公司也可以呢？
谢谢，祝感恩节快乐！