I hope i understand what you are asking.
If you have the Script runner plugin you can go this way .
Now to get the custom field object, press F12 then click on inspect in the Firefox developer view, drag the cursor to the field on create screen, and then you will see "customfield_id" You can also get the by going to custom field on the JIRA admin panel and edit the field then you will see the id, so you will now have "customfield_id"
CustomField cf86900 = ComponentAccessor.getCustomFieldManager().getCustomFieldObject("customfield_86900")
String cf86900Value = issue.getCustomFieldValue(cf86900)
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