First of all the moment, your I-140 is approved no matter which category EB-1 or EB-2, the Priority Date is yours to keep that means if you got your green card filed in let's say 2017 and you left this employer after the I-140 approval, they revoked your I-140 and you started another green card in 2020 your Priority Date will be still 2017 because your I-140 was approved. So the moment the I-140 was approved the Priority Date becomes your property and it can be carried across categories, across employers, and across geographical areas. So if you go from a PERM filing in New York to an employer in California and your previous filing was EB-3 next filing is EB2 or even EB-1 you can carry the date of the work petition as long as the I-140 was approved. The moment the I-140 is approved, the Priority Date is yours.
There are limited exceptions unless the I-140 is revoked for fraud, etc., by the USCIS. Even if the employer revokes the I-140 you will keep your Priority Date. In addition to that, if the I-140 gets approved and stays approved for 180 days you will not only carry your Priority Date you will carry your right to extend your H-1 through any employer indefinitely. You will get a second benefit after 180 days and if the lawyer revokes the I-140 you will still get the benefit of both Priority Date and the right to extend your H-1 through any employer. The government has also said if you have an H-4 EAD for your spouse, your I-40 stayed approved for 180 days your wife's or your husband's H-4 EAD is safe even if the old employer revokes the I-140 later on as long as the I-140 stayed approved for 180 days. So if you left but the I-140 stayed approved for 180 days H-4 EAD is safe. That, in a nutshell, is the general law. More
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My wife and I got the I-485 approval email notice in June 2007. We filed the I-485 in April 2007. The LC was done by another law firm and I switched to Rajiv and filled the I-140 and I-485. The I-140 was approved in one week under Premium Processing and I-485 was approved in less than 3 months. I told our company HR to switch to Rajiv S. Khanna and we are processing our employee’s H1B and GC through Rajiv. During the GC process, our company was sold and Rajiv and Mathew helped to resolve this issue, rather than starting the GC process from scratch. Mostly I dealt with Prerna Mehta and Mathew Chacko. Both provide me excellent help and support during the process. I dealt with Rita Dhakal for a short period of time and she helped me in great deal. Mathew called me on my cell phone to answer my questions, and he was polite, fast and correct. Also, I praise Prerna for checking my documents and forms thoroughly (I did not get any RFE) and providing correction/feed back immediately. I found the Rajiv’s immigration forum would be one of the best places for gaining more knowledge, and I would recommend every one to read and learn more.