Im building a form in freeform and it is going to contain many state select dropdown fields. Is there any way to duplicate this field so I do not have to populate the options/values manually every time I use that field?
Not manually but you can search for the field in your database. If the plugin uses the normal
craft_fields you can copy it's settings and paste it in a new record
Using the Craft Element or Predefined Data feature in Freeform, you can easily setup options (from Craft Entries, States, Number ranges, etc) for when you're creating additional fields. If you're referring to custom data, if you've created the field through Freeform -> Fields manager area with the options, you can also duplicate fields from there.