The Import/Export section of Ninja Forms can be accessed under the Forms heading on the left side of your WordPress Dashboard.
Select the File of the form that you would like to import. Ninja Forms Form exports will have the .nff extension.
Once the File is selected, press the Import Form button.
Select the Form you would like to Export using the drop-down.
Once the Form is selected, press the Export Form button.The exported form will have the .nff extension.
You can use this feature to export a Form from one site to another or duplicate a Form within the same site.
Import Favorite Fields
Select the File of the form that you would like to import.
Once the File is selected, press the Import Fields button.
Export Favorite Fields
Select the check-boxes next to the Favorite Fields you would like to Export.
Once the Fields are selected, press the Export Fields button.