My Employer has filed my GC in 2014 and I got my I140 but if I want to change a different role within my organization (Changing Cost center), will that impact my current GC processing. Should they start the GC processing from the begining ?

I have been working on H1B for a IT consulting company ( employer A), at a client location. My employer will file for I 485 in about 2 months. I am thinking of a few alternatives and wanted to understand the scenarios in which my GC petition might get cancelled or denied by the USCIS or considered abandoned by me. What precautions I need to take if I follow any of the below scenarios.<br>

1.Take a job with a different employer ( may or may not be same/similar to the job with employer “A” )<br>
2. Leave and join a graduate program full time ( may be after I get EAD, so that I do not have to change to F1 student visa)<br>
3. Leave the employer A and leave the USA, go to home country, India. I may or may not take a job in India which may or may not be same/similar to the job with employer “A”

I am on H4 EAD working in a full time job .Now as their are news coming to revoke H4 EAD, if the H4 EAD rule revokes, what might be the other options for me to continue my job? If I join masters, will I get the CPT if I change to F1 visa in the final semester. Is it valid like that?

I am working on H-1B for Employer A. I want to switch jobs and need a study time for about 3-5 weeks full time. I was thinking if I could go an unpaid leave from my current job for 5 weeks, and use this time for my preparation? It gets tricky as I cannot tell my current employer the actual reason for my intended leave. How will my H-1B status get affected due to this? Can I be in the US during this time? If yes, under what conditions?

What is the likelihood that because of working in a dis-similar job, for a different employer, on EAD , my I-485 ( and the GC ) could be denied?

Wife's H4 change of status application (I-539) and EAD (I-765) filed concurrently and in process. Can she travel outside country, get H4 visa stamping done and reapply separate EAD (I-765) again?

My father recently renewed his B2 Tourist Visa - and was given the 10-YR Multiple entry visa. He is currently visiting USA and his current I 94 expires in end of May 2019. Due to some medical issues - we were contemplating about requesting a 2 to 3 months extension for his stay - if possible. Would you necessarily have to provide an evidence in the form of a return ticket (about 3 months hence from end of May 2019) - to prove that he indeed intends to go back