1. I do not cancell the pending NIW I-485,

actually, the pending NIW I-485 had new LUD on 09/07/07 without message change. The approved EB1a I-485 also updated on 09/07/07: curent status: card production ordered.

2. Same A number. I believe that the reason for NIW I485 was transfered from TSC to NSC is because they found the EB1a I-485 with the same A number.I searched some forums with similar cases: The cases were transfered to NSC when you requested relink or filed second I-485. Explanation from Xiaobaitu: USCIS will combine all your files in one folder under the same A number.