In theory I know RFE means more information is needed, but practically does RFE increase the chances of rejection for L1A ?

The USCIS requests the evidence so they may approve the petition. Experienced immigration counsel should assist your employer.

When should be the earliest date by which I should do this conversion so that I can apply for I 94 extension ?

Your employer should file the L1A immediately in order to change status.

What would be my Status of staying and working in US after filing COS from OPT EAD to H4 EAD?

1) crossing the limit of unemployment is a violation of OPT; 2) you may work on OPT EAD until the H4 is approved

absent a contract provision for severance pay the company would not be obligated. You may have unemployment benefits available. You should consult...

When a h1b transfer petition is filed, and is denied for some reason, is the current h1b/job/GC process affected in any way?

Your current H-1B status/job position and ongoing GC process should not be affected in any way. Unless, your current employer discovers and cancels...

Can I work on both jobs simultaneously.I am currently on OPT started on Jan 2016. contract will be for 6 months starting april.

You should notify the DSO to update your I-20 and the SEVIS record.

O-1 is a nonimmigrant visa for prominent artists requiring an employer sponsorshipz. EB1 is an immigrant visa for extraordinary persons not...

I came to USA on L1B visa status from 13-Jan2010 and after that i went on i-94 for same VISA in (year 2013,July,).

to have a H1B cap subject petition available you must be outside the US 365 days before the H1B cap date filing. An employer should consider...

H1B transfer while stamping

You must be in the US for a change of employer petition. There is a concern about misrepresentation to the consulate.

Will i be able to work as soon as i start my education in the US with student VISA with a CPT program?

Full-time CPT will eliminate post-graduate OPT. It is generally unlikely, CPT will be available your first year.