Hi
I think I have some options:
1. create two classes (like folder): F1 (for top menu) and F2 (for bottommenu) and use class filter in fetch
2. create two section: S1 (for folder A ... C) and S2 (for folder N...O)
3. set priority from 1 to 99 (for folder A ... C) and from 101 (for folder N...O) and (in fetch) use sort_by, array(priority,true()) and
'attribute_filter', array( array( 'priority', '<', '100' ) ) for folder A ... C
or
'attribute_filter', array( array( 'priority', '>', '100' ) ) for folder N...O 4. something else, but I haven't got an idea