public interface IEntityViewModel<T> where T: IEntity
{

    void CopyTo(T target);
    void CopyFrom(T source);

}

public abstract class BaseEntityViewModel<T> : IEntityViewModel<T> where T : IEntity
{

    public virtual void CopyFrom(T source)
    {
        // Code
    }

    public virtual void CopyTo(T target)
    {
        // Code
    }

}

public class DefaultEntityViewModel<T> : IEntityViewModel<T> where T : IEntity

public class CarViewModel : BaseEntityViewModel<Car> { }
public class BicycleViewModel : BaseEntityViewModel<Bicycle> { }
public class BusViewModel : BaseEntityViewModel<Bus> { }

new DefaultEntityViewModel<Car>().CopyTo(car);