Interfiling from EB-3 to EB-2

[TK72]

Hello All,

Here is my situation. (It is same employer through out my GC process)

- Current H1B approved till July 2023
- EB2 I140 approved with priority date Sept 2013
- I will soon file EB-3 downgrade with concurrent I-485, EAD and AP, assume that before 31st Oct 2020, my concurrent filing is done.
- Assume that in 8 months, I am getting my EB3 I-140, EAD and AP approved (I-485 is still pending).

Scenario :- Now let us say, after 1 year, EB3 retrogress and EB-2 moving faster and I want to go back to EB-2 Queue. I heard something like "Inter-filing" but it does not clearly answer below points.

Question :- Does it need a new PERM ?
                  - Does it need a new EB2 I140 ? (or I can use the previous one which is still active) ?
                  - and most important point, does it need a new I-485 ? (because the I-485, which is pending currently is based of EB3 I-140).
           
                    Basically, trying to know exact procedure and sequence to go back to EB2 queue.