Create an export mapping for the different entities and export the data with a microflow.
Create an import mapping for the different entities and upload the exported data and perform an import xml action in a microflow.
Th you should be good to go. (would be nice if this was a default part of the module)
Also have a look at the Excel Exporter Template Manager module: https://appstore.home.mendix.com/link/app/16873/
I agree with Erwin, would be nice if this functionality was added to the Excel exporter module itself like it is in the Excel importer module.