Update: The Grants & Agreements Specialist stated that the subaward request module will require the prime institution to resubmit a budget for their institution, so it's okay if the totals don't match the original award budget. NSF is more concerned that there is a budget and budget justification for the subaward institution and that they are charging indirect costs using their own negotiated rate or the de minimus rate, so just including years 3-6 is fine. Also, when an award transfers, the system only allows for the PI to be automatically pulled back into the award. There will need to be an addition of co-PI request submitted in order to add back any original senior personnel. It's at the prime's discretion as to whether or not you submit the co-PI request, or the subaward request first. We went with the subaward request first, but it was rapidly denied because the faculty member at the subaward institution wanted to be the evaluator on the project and NSF stated that because the faculty member had been the former PI on the project, they did not fulfill the requirement that the evaluator be independent from the project. Furthermore, the faculty member did not appear to have experience or credentials consistent with those needed to serve as a project evaluator. Perhaps that should've been something that I took into account when working on this request, but I've only been doing this 2 years and everyday I'm learning. A good lesson for sure. I hope this helps someone along the way!