Adding sub-categories for Problem Types

As a IT admin I would like the option of adding sub-categories to Problem Types so the end user submitting a work order can be more specific in their request.

Instead of having a separate Problem Type for each of the following, they could be grouped by category.

(Example from https://support.mlworkorders.com/hc/en-us/articles/11458423508379-Manage-Purposes-Problem-Types-And-Budget-Codes)

Audio/Visual

Email

Hard Drive

Interactive White Board

Internet Connection

Internet Filter

Laptop

Miscellaneous/Questions (IT)

Mouse

Internet Connection

Password

Printers

Projector

Server

Software Application

Student Database

Telephone Services

Virus

Website

With sub-categories we could have these problem types grouped under a category, for example:

Hardware <--- (Main category or Problem Type)

- Audio/Visual <--- (Sub category or Problem Type)

- Hard Drive

- Interactive White Board

- Laptop

- Mouse

- Projector

- Virus

Network

- Internet Connection

- Internet Filter

- Website

- Server

I think having sub categories will help the user to be more specific when submitting their request, and will also help IT with assigning requests to a different Tech Support person based on the request type.