I'm in US with L1 visa with employer A . I have applied H1 COS through employer B. My H1 Petition status is not approved yet. I wish to continue in L1 with employer A. if My employer B does not cancel my COS can I still work with employer A on L1?. L1 is valid until 2014 and I got it stamped from my home country. Can I leave US and re enter with my L1?