If you are a registrar and you have a coach from a previous season that you wish to manually copy over to this season, without them having to volunteer again, you can do the following:
1. Go to Manage Coaches.
2. Search for the current season, with volunteer position "Any" or "Hasn't Volunteered".
3. Find the coach's name and click on it.
4. Use the dropdown to select a position for them for the current season.
That's it! The coach's volunteer record now includes an entry for this season and you can assign them as a coach of a current team.