You can remove an externally published post at any time while still leaving it available in the internal site blog.
In the Blog browse the posts to find the one you want to remove from the external
Fastpath: Select the Published Externally filter in the browsing pane to display only the externally published posts.
Click Remove Externally.
Optionally, open the post to perform this action.
A message indicates the post has been removed from the external blog.