URL: <jira_base_url>/rest/category-level-rest/1.0/root
Method: GET
Data: -
Result:
[ { "self": "<jira_base_url>/rest/category-level-rest/1.0/root/18", "id": 18, "value": “Tech” } ]
URL: <jira_base_url>/rest/category-level-rest/1.0/root/<id>
{ "self": "<jira_base_url>/rest/category-level-rest/1.0/root/18", "id": 18, "value": “Tech” }
Method: POST
Data:
{ "value": "New Option Tree" }
Method: PUT
URL: <jira_base_url>/rest/category-level-rest/1.0/root?id=20
Method: DELETE
Result: -
Jira's API is used to update/remove/add Multi Level & Tree Field on Issue.