Resource leveling doesnt do anything

Hi Richard, building up on what John and Trevor noted above, what leveling does is remove overallocations by spreading out the work.  It looks at the priority field, resource and work calendars, and pushes out lower priority resource assignments to remove overallocations in your schedule.  That's a summary of what leveling helps you with.

The first step is always to review the 'resource usage' or 'task usage' views in Project, and move the hours so you are no longer overallocated (manual leveling). By doing this you are solving your problem by thinking through the solution (when tasks should resource A work on, when).  You may come up with timing solutions you hadn't considered by doing this.

Project's leveling engine can automate this process with suggested spreading of the work. We always recommend doing the first (manual), and then trying the 2nd to see what kind of results you get.  You can always 'unlevel' and go back to your starting point.