H-1B Visa

I have my PERM approved from my current employer A recently this month, can I still use my PD when I transfer my H1B to a new employer B, before I-140 approval or when I-140 is in progress with the old employer A?. If my job title is changed (from 'Software Engineer' to 'Business systems analyst')with changing job to the new employer B, can I still use the approved perm from employer A for the PD or to extend my H1B max stay beyond 6 years?

After H-1B transfer is approved with the new employer, how long do I have to decide if I can to join the new employer? Can I join after 90 days of H-1B transfer approval? Is there a deadline?

My employer ended my employment due to COVID reasons on May 31, 2020 but I never received an official termination letter. Calculating the grace period depending on the assumed termination date mentioned above, I have till July 30 to find a new job. Should my new employer give me an offer or start the H1B transfer application before July 30? What happens if they fail to do so in time? Can I extend the grace period on the basis of having an offer in hand or maybe because of the pandemic? My final interviews with potential employers are being withdrawn because of the time restriction.

I am having H4-EAD,Can I start any business?

Questions,
1. Can I stay in Vancouver while I commute to Seattle for work once a month for a day?
Is there any restriction on the amount of time I need to spend inside the US on H1B?
Is there any restriction to how frequently I can go in/out of the US on H1B?
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2. Since my work location would be changing to Seattle from California for me to be able to do this. I am suspecting my PERM will need to be refiled. But given that my H1B is expiring next year and the PERM, I140 process takes almost 1-1.5 years. Can my current company use an older existing approved I-140 petition to help me get my H1B Visa extended? My older I-140 had been approved for more than an year before I left the employer.
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3. Will doing this have any impact on my H1B Renewal? I would need to go for re-stamping next year in September.

I came to the US on H1b in 2010. My i140 got approved in Dec 2013. I joined a new employer on 21 Feb 2020. My H1B got approved till 20 Feb 2023, But I did not receive any receipt notice for my wife and my elder son H4. My employer told me that he applied for an H4 visa for my dependents.

Unfortunately, I got laid off due to COVID-19 and my employer notified USCIS on 8th June 2020 to revoke my visa. My priority is to find a new job. But in case I do not find any job I would like to move out of the USA, I do not want to accrue unlawful days. But, due to the COVID-19 situation in India, I am scared to travel to India.

My wife called USCIS and was asked to email USCIS on lockboxSupport@uscis.dhs.gov to notify her of the receipt number of my wife and son. But she has not received any response.
I want to stay in the USA until the COVID-19 situation becomes normal. As per the Document COVID Coronavirus Converting to B-1 B-2 status.pdf on your website, I can apply for a change of status to B1/B2?

1. My son is currently a student studying engineering at a 4 year public college in Illinois. I am working in the US on H1B, and my son is on H4. The issue is that he turns 21 next year before he would finish his final year in college, and since would age out of the H4 So what are the options he has left to continue his study Can he change to F1?<br>

2. What are the caveats to this? Can he do the adjustment of status in the US, or does he need to travel out of the country? I've heard that F1 visa processing takes a long time to process, and there is no determinate time - he has about 14 months for him to become 21 years as of now. When inquired the college said they are not processing the I-20s for Fall 2021 now, only for Spring 2021, and have asked him to wait, what are the consequences of this ?