You’re going to have to recreate the field and adjust the name slightly since you can’t have two fields with the exact name. We often append 1, 2, 3, etc. onto the field name to make things easy. If your field has a lot of choices, a kickstart would be the quickest way to create the field. My man Karlton has a kickstart template for fields/parameters I could dig up if you’re interested.
-Narayana