Here you can select which workflows included in the import package will be imported. The following extra option can be configured:
•Import all workflow scopes - if checked, all workflow scopes will be imported, even if a respective workflows are not selected. Import web part and zone variants with the selected page templates. This check-box is only displayed when the import package contains an exported website, not only separate objects. If you are importing to an existing site, this option is de-selected by default.
Detailed information about the built-in export/import functionality in Kentico CMS can be found in Developer's Guide -> Managing sites -> Export and import.