It is always quite tedious, boring and heavy work to extract pages from a PDF to add them to another PDF. This task is what you want to avoid this program called PDF U Append Desktop Edition.
It is responsible for automating the entire process, that is, from the PDF interface U Append Desktop Edition you indicate which are the pages to be extracted from the original PDF and where they should be inserted in the resulting PDF. It's that fast and that easy. Even PDF U Append Desktop Edition allows you to set different ranges of pages to insert from the same PDF, as well as other tools such as automatically inserting blank pages into odd pages, etc.
You can free download PDF U Append Desktop Edition 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.