vipsha,
I had this discussion with Jim Mills, the immigration attorney on this forum and he said that you have to be very careful accepting promotions etc. The job description has be be very similar to labor. The natural progression theory does not work due to anal interpretations of the labor law by IIO's.
This is very interesting, because of the inordinate delay in processing 485 cases, the original labor usually is not sufficient to keep pace with normal life. I wonder if INS will come out with a guidence on this case. It is so possible that people get promoted etc. over 2 years, how does labor apply to them?
gnu01,
Best bet would be to talk to a lawyer, and make sure that the job profile offered to you fits your labor!