09/12/2006 Michael Aytes Memo, section 22.2(d)(3) page 28:
http://www.uscis.gov/files/pressrelease/afm_ch22_091206R.pdf
(3) Priority Date Based on Earlier Petition.
If an alien is the beneficiary of two (or more) approved employment-based immigrant visa petitions, the priority of the earlier petition may be applied to all subsequently-filed employment-based petitions. For example:
Company A files a labor certification request on behalf of an alien ("Joe") as a janitor on January 10, 2003. The DOL issues the certification on March 20, 2003. Company A later files, and USCIS approves, a relating I-140 visa petition under the EB-3 category. On July 15, 2003, Joe files a second I-140 visa petition in his own behalf as a rocket scientist under the EB-1 category, which USCIS approves. Joe is entitled to use the January 10, 2003, priority date to apply for adjustment under either the EB-1 or the EB-3 classification.
http://www.uscis.gov/files/pressrelease/afm_ch22_091206R.pdf
(3) Priority Date Based on Earlier Petition.
If an alien is the beneficiary of two (or more) approved employment-based immigrant visa petitions, the priority of the earlier petition may be applied to all subsequently-filed employment-based petitions. For example:
Company A files a labor certification request on behalf of an alien ("Joe") as a janitor on January 10, 2003. The DOL issues the certification on March 20, 2003. Company A later files, and USCIS approves, a relating I-140 visa petition under the EB-3 category. On July 15, 2003, Joe files a second I-140 visa petition in his own behalf as a rocket scientist under the EB-1 category, which USCIS approves. Joe is entitled to use the January 10, 2003, priority date to apply for adjustment under either the EB-1 or the EB-3 classification.