Welcome to the community. Unfortunately, it is not possible to have cascade field with more than 2 level (parent - child) that I am aware of.
Maybe there are paid third party add-ons that you can look for in the Marketplace.
Best, Joseph Chung Yin
Jira/JSM Functional Lead, Global Infrastructure Applications Team
Viasat Inc.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.