installing prebuilt website to a network

Hi, I want to install a prebuilt website to my subdirectory. I setup network and everything is ok but when I want to install a prebuilt website to subdirectory, it warns me :

Before installing a new pre-built website, it is recommended to clean up your WordPress database.

Important: This tool DOES NOT create backups.

  • Deletes: Posts, custom posts, pages, menus, categories, comments, etc.
  • Remains: Users and passwords, wp_options, files on your server.
Does it mean something can happen to main website? I dont want to lose it of course. Please help.
Thanks

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