Hi,
you can use the Mendix Excel Importer from the app store. https://appstore.home.mendix.com/link/app/72/
Don’t forget to run the MxModelReflection before creating a new template. :-)
Best regards
Tjark
This How To provides a thorough explanation of the steps you need to follow: https://docs.mendix.com/howto/integration/importing-excel-documents#1-introduction