Create a pdf with just certain pages from a pdf
What you might want to try is this:


Duplicate the PDF you want to remove the pages from in the Finder
Open the duplicate file, show the sidebar
Select the page(s) you no longer want and press the backspace key
Once you have deleted the pages you no longer want, save the duplicated file.
If you like you can then open another PDF and drag the thumbnails from one sidebar to the sidebar of the other document, thereby adding pages from one PDF to another.


Hope that helps.