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vba - Copy selected text from one document and paste to new document in same position on the page - Stack Overflow
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You're expecting someone to do a lot of coding for you obtain a trivial paper saving.
Surely it would be simpler to save the original document so you can keep adding to it. If you're really desperate to save paper, reformat the older content as white text so you can reuse the paper and have only the new content print.