Priority-date retention is governed by 8 C.F.R. § 204.5(e). Where a petitioner has an approved I-140 in one employment-based category and files a subsequent I-140 in another employment-based category, the earlier priority date generally carries forward to the later petition. The retention is automatic upon approval of the second I-140 and is recorded in the receipt notice; petitioners and counsel do not have to take separate action to claim the priority date, though it has to be tracked.
The standard at 8 C.F.R. § 204.5(h) for EB-1A is more demanding than the Matter of Dhanasar standard for NIW. EB-1A requires extraordinary ability through receipt of a major internationally-recognized award or satisfaction of at least three of the ten criteria, followed by the Kazarian v. USCIS, 596 F.3d 1115 (9th Cir. 2010), final-merits analysis. NIW asks whether the petitioner's work has substantial merit and national importance, whether the petitioner is well-positioned to advance the work, and whether on balance it would be beneficial to waive the labor-certification requirement.
Where the petitioner has a pending or filable I-485 adjustment-of-status application, INA § 245 governs eligibility. INA § 245(k) provides a narrow exception for employment-based applicants who have been out of status or unauthorized employment for 180 days or less aggregate.
The visa bulletin is administered by the Department of State and is updated monthly. EB-1A is current for many countries and substantially backlogged for India and China. The backlog dynamics for India and China shift, sometimes meaningfully, between bulletins. Counsel typically tracks the bulletin against the petitioner's chargeability before recommending a filing strategy.