How to add nested boxes on hive flutter ?

**Question**
Please explain the problem you are running into.

**Code sample**
```dart
Provide a few simple lines of code to show your problem.
```

**Version**
- Platform: iOS, Android, Mac, Windows, Linux, Web
- Flutter version: [e.g. 1.5.4]
- Hive version: [e.g. 0.5.0]

The issue does not name a file, test, or concrete code example. First clarify what “nested boxes” means in Hive, including the intended platform and Dart, Flutter, and Hive versions; done would be a clear explanation or documentation reference showing whether and how this is supported.

Written by the indexing model from the issue text.