Can I hold L1 Visas with different employers on two different moments?

Simply put - No; as long as you worked for them abroad for the requisite time.

Can a legal permanent resident leave US without doing biometric (fingerprint) collection?

Either maintain your residency by returning after a short trip or complete the biometric, and then stay abroad for over a year upon approval of...

I've in USA since a child non-document immigrate. Now an adult still not have a green card. Wih to find a Probono lawyer.

I agree with Rajesh.

My H1b visa expired on 9/17/2012, and my denied was on 1/23/2013, when does the 180 days start?

I agree with Christian.

I applied GC on EB2 (porting from EB3) , I 140 filed on Aug last week 2012, so for no I-140 approval?

If you can filed I-485 (i.e. your priority date is current), may be you can ask your employer to seek premium processing for the I-140.

Sponsoring H1B Visas for Off-Shore Resources

Ensure you have sufficient funds to pay their wages.

I'm in US on L1B in empl.A & they applying H1B. Empl. B is also ready to sponsor H1B. How H1 will be filed if I join Empl. B ?

1) Depends on your employer, whether it is a cap subject or cap exempt. 2) Oct 1 is the start date for cap subject employer 3) The processing...

Is there any way should i able to adjust my withholding of removal status?

You may be eligible for immigration benefits. However you should seek a complete review/ consultation for your case.

What would work would depend on your status in the U.S.

Tourist Visa for parents ?? (Created a difficult situation by ignorance/stupidity)

Your parents should consult with an experienced immigration attorney before they fill out the forms and apply for their visitor visa.