According to law it is evident that even with an approved EB-2 case, you have the option to file the I-140 under EB-3 – that's a choice open to you, and no one can dispute it. However, this doesn't mean that your I-140 and PERM are permanently tied to EB-3. What is typically done is filing the I-140 under the category that offers a more advantageous date. For instance, if you are in the EB-2 category and the EB-2 date is more favorable, you would file under EB-2. Conversely, if EB-3 is more beneficial, you would choose that option.
It's important to note that you cannot upgrade from an EB-3 PERM to an EB-2 I-140, but you can downgrade from an EB-2 I-140 to an EB-3 I-140 – or the other way around, downgrading from an EB-2 PERM to an EB-3 I-140.
So, when you have an EB-2 PERM, you have the flexibility to file under either EB-3, EB-2, or both. Importantly, this filing of the I-140 does not terminate your case or prevent you from returning to EB-2 in the future. Thus, there's no compelling reason not to consider filing under EB-3. As for whether it's better to file your case under EB-3 or EB-2, my recommendation would be to file I-140s for both categories – EB-3 I-140 and EB-2 I-140. However, for the I-485, it's advisable to file with EB-3 – that's likely the most suitable course of action.
I had an accident and am on disability while my green card adjustment of status application ( form I-485 ) has been pending for over 4 years. My I-140 had been approved about 5 years back but my case has been caught up in the visa backlogs at USCIS and Department of State. I wanted to know if there was any provision for help in the immigration laws, in case I am sent for long term disability or my employment is terminated before I receive my green card. I learnt that employment and disability are subjects to be discussed with a benefits or employment attorney. The only immigration benefits are via AC 21 or via a private bill. Also, that one should not loose the advance parole anytime while the AOS is pending. I want to thank Mr. Rajiv Khanna for his generosity with time and expert guidance. Over the phone I found him to have a very pleasant personality. he had me feel comfortable and didnt seem money minded at all.