Link Away makes it easy to replace a post's permalink with any URL you choose on a post by post basis. Link Away adds a field to the post admin p
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There is no settings page, just look for the Link Away settings box when editing posts. Works on regular and public custom post types.
It's a pretty simple plugin. If you don't want to change a post, just ignore the Link Away settings, but when you do want a post to link away, add the complete URL where you want users to go.
Optionally, you can select to have the new location open in a new window.
Click the test button and the URL will open in a small popup in case you want to verify the URL before you update the post.