Since v7.0.2, Multi-Level Cascading Select supports ScriptRunner integrations.

Avoid yellow spaces

When you copy/paste the code below, please make sure to get rid of the yellow spaces (shown in this picture). They will raise a “Type checking error” in your console.

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How to get option IDs

To get to know the custom field and the option’s IDs, in the custom field context configuration screen click on Edit Options and Export CustomFields.

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This is a sample JSON file with the information you are looking for: