I traveled outside US with H1B approved not stamped, and I reentered US with my F1, will this affect my green card process?

Surprised you were admitted in F1 status and hopefully you have not provided fraudulent statements to facilitate entry. You you can hold only one...

What do your Immediate relative do if adjustment of status is in process ,but I-94 date expires on visitor's visa?

There is no requirement or expectation to extend visitor status after filing AOS. Indeed, as you have noted the nonimmigrant intent directly...

Should i file an H1B Amendment with extension or only Extension

Based on these facts, it appears that your employer can file its H1B extension with continuation of previously approved employment so that it can...

What is my class of admission for App. For Travel if I was originally in the US on L1A visa, subsequently married a US citizen?

Do not travel outside the U.S. under the circumstances without advance parole document or your adjustment of status application will be denied....

H1B?

There is a 60-day grace period to remain in the U.S. or to file a change/extension of status application during this period after employment...

Can L2- EAD work for American company from Outside US?

EAD is not required to work outside the U.S. and you also do not have to worry about "abandoning" your L2 status.

Traveling internationally on EAD / AP when H4 is pending

No problem with entering on AP but pending H4 application will probably be denied upon departure. Will be able to work/travel and can extend EAD/AP...

As it is not legal to copy the naturalization certificate so how do i attach a copy with the i-130 form as its required?

It is acceptable to copy the naturalization certificate for filing the I-130 petition. Generally do not mail any original document to the USCIS...

Porting the priority date does not negatively impact the validity of the I-140 petition whose priority date was ported.

How much money I need invest in USA for l1a visa?

No minimum investment but the U.S. company must be ready to do business for example by having a lease for office/warehouse space, a business...