Create and Import Multiple Categorie

1. Is there any way to create several categories with icons and export and import from my other sites.

So, I don’t want to create the same categories with icons on every site.

2. Am I able to create sub-categories under main categorie like the below

Main Catgory 1
|
|_Topic 1
| |_sub Topic 1
| | |_sub sub Topic 1
| |_sub Topic 2
| |_sub sub Topic 1
|
|_Topic 1
| |_sub Topic 1
| |_sub Topic 2
| |_sub Topic 3
| |_sub Topic 4
|
|_Topic 1
| |_sub Topic 1
| | |_sub sub Topic 1
| |_sub Topic 2
| |_sub sub Topic 1
|
|_Topic 1

Main Catgory 2
|
|_Topic 1
| |_sub Topic 1
| | |_sub sub Topic 1
| |_sub Topic 2
| |_sub sub Topic 1
|
|_Topic 1
| |_sub Topic 1
| |_sub Topic 2
| |_sub Topic 3
| |_sub Topic 4
|
|_Topic 1
| |_sub Topic 1
| | |_sub sub Topic 1
| |_sub Topic 2
| |_sub sub Topic 1
|
|_Topic 1