Deleting a site may affect many aspects of your store, including orders, reports, and a number of store settings. You should not delete a site that is currently in use with your production environment. You cannot delete the default site. If you want to delete the site that is currently the default, first make a different site the default.
To delete a site:
Click the menu icon, then click Settings.
Select Setup from the list of settings.
Pick a site to delete from the list that appears above the settings list.
On the General tab, click Delete.
Click Continue in the Warning box to confirm that you want to delete the site.
Click Save on the General tab.