The archive function is a great idea. However, my plans all seem to go back to the Assembly tab from time to time. I suspect that this has something to do with using the portable workstation but I cannot readily reproduce it. It is frustrating to spend a long time to archive plans (it is very tedious) to have them suddenly reappear back where they started. The amount of time that it takes for them to go back has been as short as a day but it also happened after a couple of weeks.