User Question

I have a custom field for every user called position. This is for their position in our organization. Is there a way to create a drop-down menu that would appear on everyone’s user page so I as the admin could select what position they have? If so, would there be a way to create a hierarchy for the positions? For example, I would want president to be above treasurer in the hierarchy. I have a plugin called member lists and I want to be able to sort by position, with the order being: 1. President, 2. Vice President, 3. Treasurer, etc, rather than alphabetical by position. Any help would be greatly appreciated. Thanks!