I did it so long ago, I'm not sure how I created the landscape pages. But I did this: If you have already created the custom landscape page(s) in another file, you can open that file, navigate back to the current file and use File > Import > Formats and then just check Page Layouts. Note that this will import all master pages to the new file, and if the default Left and Right pages are different, they will be overwritten. You're right: it does overwrite my master page in the portrait document. How do I apply it only to one page in the portrait document? I want to apply it only to one or two landscape pages, which I created using Insert > Add Disconnected Pages and then rotated. I see now that won't work.
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