How to create a state of origin and local council field under employee doctype

I have been able to use a custom field to create “STATE” inside Employee doctype, I want to also create a field called “LOCAL COUNCIL” and I want if I chose a state, all the Local councils under it will be shown under the Local council field for selection.
Does this require a developer? or can a non-developer be able to add this feature?
If a non-developer can do it, Please can someone guide me on how to do it, Because in our organization, a staff state of origin and Local council is an essential part of our staff record.

Thank you