using drop downs. How can I link data to drop down funtion?
You haven't said what system this is, or explained what "link data to drop down function" really means. Or even what "drop down" means - a field? Menu? Something else?
In Jira, you enter the options in a field's option list. For the menus in most applications you can add web-items via code. And so-on. But we kind of need a clear explanation of the question before we can tell you much.
So this is nothing to do with Atlassian applications?
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