The Battle Master subclass for fighters says that you can get more maneuvers at different levels:
You learn two additional maneuvers of your choice at 7th, 10th, and 15th level. Each time you learn new maneuvers, you can also replace one maneuver you know with a different one.
If I have multiclassed, do I gain the maneuvers when I reach the listed character level? Or when I reach that level in Fighter?