When you import a demo content, it typically includes all the pages and content associated with that demo. If you want to import only some sections then you can try importing using our templates library.
Read our detailed documentation for help: https://xtemos.com/docs-topic/templates-library/
Import the demo on the staging site as you want and you can import-export any content by means of default WordPress functionality: Dashboard > Tools > Import/Export. Export the content from the staging site and import it on the production site.