What exactly is interfiling?
You have an EB-2 approval and you decided you wanted to downgrade it to EB-3. You filed an I-140 for that and you applied with an I-485 with that because the dates for EB-3 were moving faster and they were current.
Now when you want to move your application back to your EB-2 case you do something called interfiling.
Below are a bunch of frequently asked questions on interfiling discussed recently on our Community Conference Call.