Replace pages
You can replace one or more pages in the document with a selection of pages from another document. Text, images, links, and comments on the original pages are all replaced, whereas bookmarks and interactive elements associated with the original pages are not affected.
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Open the PDF file and choose any of the following:
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Choose Document > Replace.
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On the sidebar navigation pane, click the Page Thumbnails icon to open the panel. Then click the Pages Panel Option icon and choose Replace….
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In the Open dialog, select the document containing the replacement pages and click Open.
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In the Original section of the Replace Page dialog box, enter the pages to be replaced in the original document.
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In the Select Source Pages section, specify the replacement page range. Click OK.

A. Enter the pages to be replaced in the original document. B. Specify the replacement page range.