A position change should be a move a real staff would make in spring ball — not a way to farm one athlete across the depth chart.
Inside a position group, move freely. No declaration needed:
- Offensive line: LT / LG / C / RG / RT
- Linebacker: WILL / MIKE / SAM
- Safety: FS ↔ SS
- Edge: LEDG ↔ REDG
Crossing groups needs a public declaration — corner to safety, edge inside to tackle, receiver to tight end. Post the player and both positions before the change takes effect, wherever your league keeps roster announcements. Your commissioner names that venue, and can decline a move that is roster laundering rather than football.
Athletes (ATH) have no home group, so the test is playing time: put him where he is top five on your depth chart, and declare it.
Formation and package substitutions stay unrestricted. This rule is about a player's listed position, not about your personnel groupings.