If you have built a Landing page and later want to duplicate it as a Blog post, Product page, or Collection page, then you can do easily with Zeno.
First, go to the Library, open Saved tab and click on Save current page
Create a new Blog post, Product page, or Collection page from Zeno dashboard. Then, in Zeno Editor, go to Library, Saved tab and click Use to import the saved page to the current page.