Priority Date

I had a approved I-140 from Employer-A under EB3 category with PD-Oct’12. My new Employer-B filed for I-140 under EB2 and obtained an approval. However, the PD is Jul’18 even though priority date porting was requested. Employer-A has not revoked the approved I-140. Not sure if this is a typo or default PD on the form with the assumption that I-485 can be applied when EB2 is Oct’12.

I had EB-2 I-140 with PD of March 2017 , My EB-1 I-140 is Aug 2018. My attorney has filed for amendment of priority date - How this works , will they open the case again ?
How long will it take to get the amended I-140 with old priority date.

I have I-140 approved in EB2, priority date is 2010. When date become current for EB3, I want to downgrade from EB2 to EB3 (I know I have to only refile I-140 and I-485 concurrent). What will happen if USCIS denied newly filed I-140 (EB3)? can I-485 also denied? If newly filed I-140 (EB3) denied, can I used my previously approved I-140 (EB2)?

My husband has an I-140 approved from Company A ( Priority Date April 2008 , EB2). He is now eligible for EB1 under Employer B ( He is currently on L1 A ). Can his priority date from EB2 be ported to EB1 ?

I have the following questions<br>
Can employer A revoke my current I-140 after I change my employment?<br>
Can I keep getting my visa renewed with Employer B based on my current I-140 with Employer A until Employer B initiates my GC processing?<br>
Does the hike in pay and change in roles in any way affect any of my future GC filings with Employer B?

Example Scenario: H1-B EB3. Candidate is in US for 10 years and extending his H1-B using approved I-140.<br>
If a Candidate’s Priority Date is Current can the Candidate file I-485 after 4 years of the Priority Date being Current? Is it allowed without problems?
Is there any specific limitation on the timing of filing (like I-485 should be filed within a specific time period after the priority date becoming current)