I filed I-485 in May,2001 (as the beneficiary), case get transferred to local office in Apr. 2002, still waiting for interview. My I-140 (EB3) petition get approved Aug.2002. Since still not sure when the interview can be scheduled, I want to go ahead to file another I-485 as the primary application, so can get 180 rule protection. Is that possible? Do I have to withdraw my first I-485 first? Thank you for your help!