Hello,
It is recommended to run import on fresh WordPress installation (You can use WordPress Database Reset plugin https://wordpress.org/plugins/wordpress-database-reset/ ) – http://prntscr.com/s5rhkh If you want to get pages from different demos, just use Page importer – https://youtu.be/wkIKN2IyEZI or select the desired elements on Configuration Installer step – http://prntscr.com/s5risz You can delete/change menus via Appearance > Menus.
Regards
