Currently Netro does not allow users to reset the soil moisture level. However, Netro Whisperer sensor monitors real-time environmental conditions, for example, the soil moisture level changes accordingly if you water manually. To get a proper calculation and better soil moisture accuracy, we suggest Netro Whisperer sensor and that's why we made it.
Netro currently doesn't support the feature to treated multiple zones as the same physical area and water them exactly the same, which we may support later. If your zones have the same configurations, Netro's smart schedules should be almost identical for all zones. It's different because you had manually water some zone, so zones might have different estimated moisture level. But it is totally fine. We make sure the moisture level in the a reasonable range for all zones.