"Do you have source code of...". Well, we can't answer that - we don't know what you've downloaded.
If you have a commercial licence for Jira, then you can get the source code for the whole of Jira from your licence page in https://my.atlassian.com . This includes everything you see in the "off the shelf" installation. You'll find the source for multiselect custom field types in there.
Please remember you should not publish this code.
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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