Here, you can select which forms included in the import package will be imported. You can also adjust the following options:
•Import form data - if checked, data stored in form will be imported and the original data will be overwritten. If you are importing to an existing site, this option is de-selected by default.
•Import physical files data - if checked, physical files saved within form records (if there are some) will also be imported.
Detailed information about the built-in export/import functionality in Kentico CMS can be found in Developer's Guide -> Managing sites -> Export and import.