Thanks for the question. Please clarify exactly what you want to do. I will lay out what I THINK you are asking and we can go from there.
You're asking how do I get pre-approved and know numbers on a new mortgage somewhere else.
So the big key is "are you keeping the same job or getting a new one?" Getting a new one is fine. IF it's a W-2 job. Moving and starting a new commission or self-employed job won't fly.
So we can figure out numbers in a few different ways for you if we talk. The most important question I ask clients when we start is "what do you need/want for a monthly mortgage payment?" Then we go from there and figure out debt load, closing costs, down payment etc. I can also tell you what you need to make in order to afford the mortgage you want/need. I hope this was helpful and please let me know how best to assist.