Clone View as attachment
It is possible to clone a View Display (in this case an attachment). For example:


Go to admin/structure/views/view/frontpage on your Drupal site
Select the 'Feed' Display under Displays
Under 'Feed details', notice the 'Display name' field, look all the way to the right of here and you'll notice a 'view Feed' drop down menu, click the 'down' icon
Then click 'clone Feed'


That will cone that particular display, click 'Save' when you're ready to save the changes. For your attachment, follow the steps above and replace the steps with your view, and the name of your attachment.