Go to the site within the multisite – go to tools/export and export all
Go to Master Slider and export it
Zip up the croquet theme
Either create a new empty site and use wp-cli to get the plugins correct or use an existing site and check that the set of plugins is correct.
Remove any posts, pages, calendars, tables and media and then make sure that the menus are empty. and the categories cleared.
Then go to import and install the WordPress importer if necessary and run it
Import the Master Slider json file
Upload and unpack the croquet theme then delete zip file
Tables have to be copied manually