Adding automation for multi-select information between custom fields

[sangeun kwak]

I have a question about Jira automation.

You have custom fields A and B. Both of these fields are multi-selectable with check-boxes. 

When I create an issue, I want to automatically add information from custom field A to custom field B when multiple checkboxes are selected. 

However, there are several different types of custom field A, each with different combinations (the values of the check-boxes are the same for the items, just different combinations).

I checked out the documentation below, but I'm not able to automate what I want because I have more complex conditions.

https://support.atlassian.com/cloud-automation/docs/advanced-field-editing-using-json/#Multi-select-custom-field 

Please help me how can I accomplish this?