I am currently using Microsoft System Center Service Manager(GridPro) and we have Classification categories for both incidents and service requests. Let me share example below.
For Service Requests we have:
End-User Hardware \ Printer \ Dispose Assessment
End-User Hardware \ Printer \ Installation
End-User Hardware \ Printer \ Preventive Maintenance
End-User Hardware \ Printer \ Relocation
End-User Hardware \ Printer \ Replacement
For Service Incident Requests we have:
End-User Hardware \ Printer \ Troubleshoot
Here End-User Hardware is the first category, Printer is second category and the Task/operation( i-e Installation, troubleshoot) is the third category.
We have a single field where we define Classification categories for incident requests and service requests. I want to the standard JIRA field where I can define Classification categories close to Microsoft System Center Service Manager(GridPro).