lot of Categories how to display

My Categories

1
– 1_1
— 1_1_1
— 1_1_2
— 1_1_3
— 1_1_4
— 1_1_5
— 1_1_6
— 1_1_7
— 1_1_8
— 1_1_9
— 1_1_10
– 1_2
— 1_2_1
— 1_2_2
— 1_2_3
— 1_2_4
— 1_2_5
— 1_2_6
…………………..
2
– 2_1
— 2_1_1
— 2_1_2
— 2_1_3
— 2_1_4
— 2_1_5
……….
3
……..
4
………
5
……..

There are several directories that level
Another top-level directory, and then several secondary Contents
Each has three secondary directory directory
This category showed a Home when there are several hundred connections,
Tree structure

Now like to change it to this
In Home can be displayed only when the level directory
After opening level directory, only shows the directory below secondary level directory (Grade 3 directory does not show)
After only two open directory directory showed that the level of the three-tier directory

Thank you
Also connected with the self-definition, will be in front of the directory / category / xxxx, can be removed from category

Above how things should change
Thank you