What are the consequences of maintaining H1B status, while the spouse transfers G4 visa from one international org to another?

You may or may not have a choice if you are reaching the 6th year in H-1B status at this point anyway.

Currently my H1B extension is applied by my current employer and now i got new job offer. Shall i proceed with H1B transfer ?

Multiplicity of petitions will always create confusion and potential problems. Consult with an immigration attorney.

L1B TO L1A TO GC?

If your employer was able to show that you had previously been employed abroad in a managerial or executive capacity to qualify for the change of...

What should i do to can able to use of cspa ( child status protection act ) ?

CSPA involves a complex computation of ages and dates. Consult with an immigration attorney.

How long I have to stay out of US to get fresh 6 years of H1b??

You need to have an immigration attorney review the timeline to avoid making any grave errors.

Changing the H1b employers

You would be subject to the Cap on the new petition, so you would have to wait until the FY 2017 filing period.

Job change after h1b approval but before oct1st

You should be very careful. If Company A revokes your visa petition, you may have issues with another H-1B, with any company.

I have submitted all the documents and paid the necessary fees to the NVC. when does the medical exam comes?

The NVC will not request a medical exam. The Embassy should issue instructions for the medical exam prior to the visa interview.

Can i file form i601 for my parents?

They need to establish "extreme hardship" to their parent or spouse as applicants, so it appears they do not have a qualifying relative for the...

There definitely will be a biometrics appointment before the interview. This is part of the "required record checks."