You can replace an entire PDF page with another PDF page. Only the text and images on the original page are replaced. Any interactive elements associated with the original page, such as links and bookmarks, are not affected. Likewise, bookmarks and links that may have been previously associated with the replacement page do not carry over. Comments, however, are carried over and are combined with any existing comments in the document.
After you delete or replace pages, it’s a good idea to use the Reduce File Size command to rename and save the restructured document to the smallest possible file size.

Delete pages, using the Delete command
Delete pages, using page thumbnailsSelect the page number box of the thumbnail or the page thumbnail itself.
Shift-click to select a range of page thumbnails. Ctrl-click/Command-click to add to the selection. Or, in Windows, press Ctrl+A to select all thumbnails, and then Ctrl-click to deselect the pages that you want to keep.
Drag a rectangle around a group of page thumbnails.
Choose Delete Pages from the Pages panel Options menu, and click OK.
Click the trash icon
at
the top of the Pages panel.
Delete material associated with a tagged bookmark
Replace the contents of a page
Replace pages using a page thumbnail