Can I redirect just a single Blogger.com page to an external URL page?
Yes. To do this, you can put this code inside your body of your blog post itself. This is found within the HTML section of the particular blog post or page you want to have redirected - so you select "compose" to "html".
window.location = "https://blogname.blogspot.com/blogpostname";
- is different from a 301 redirect
- is different from redirecting the entire blog to an external blog
- is also different from redirecting individual blogger.com pages to other pages within the same blog.