Hello Community!
I have tried to solve this via the following Support page: https://confluence.atlassian.com/confeval/jira-service-management-evaluator-resources/jira-service-management-how-do-i-create-a-conditional-field
However, it says that the field type “Cascading fields” includes two (2) related lists: a parent list of values, and a child list of values dependent on what is selected in the parent list.
What I need is an ADDITIONAL (3rd) Layer, so Parent > Child > xxxx. The real-life scenario is that we have a Platform > Issue Category > Issue Sub-Category:
POS Platform (1st Level):
Platform A
Platform B
POS Component (2nd Level)
Database (Available for selection on Platform A and 
Hardware (Available for selection on Platform A and 
KPOS (Only Available for selection on Platform A, but NOT Platform 
POS Component Subcategory
Maintenance (Available for selection on Database and KPOS, but not available for Hardware)
Scanner (Available for selection on Hardware, but NOT for Database and KPOS)
Any assistance would be MUCH appreciated! Thank you!