Need to file I-864

Add her income to the I-864; no need for I-864A.

Is a medical examination required for I-485 application which is marriage based, but not K-1 or K-2

Assuming you are USC applying for your spouse, she will get her medical in a sealed envelope to be submitted along with the adjustment application.

AM I eligible to apply for a Greencard under EB2 category

Yes, you seem to qualify; however the job must required an advanced degree and so if the employer is looking for a Bachelor's position, the job...

H1-b transfer with pending H1-B transfer

Since you ported, B's approval is crucial.

H-1B visa extension beyond 6 years under recapturing days option

I'd address this question to the attorney who filed the H-1B petition in your behalf. They already have your file for complete review.

I want to know about fiance visa?

Only USC can petition for Fiancé. If you are a U.S. citizen, you may want to discuss this option with an immigration attorney.

I am working US with L1 Visa. Is there any way in which would I get Green card other than my employer ?

If you qualify for a waiver, you can self petition

Generally, under what circumstance, immigration office will do home-visit? After first or second interview? Or being suspected?

It is difficult to say from the limited information you have provided.

Filing concurrently or not?

There are numerous benefits of one-step filing, and I cannot think of one for filing the I-130 alone. It may work best if you consult with an...

You will need professional help in understanding what benefits, if any, you have in appealing the decision. It works out better in some cases if...