In InDesign, you don't "read" or "import" a PDF. The term used in page layout applications is to "place. You're placing them as a graphic on the page.

Choose File > Place. If you check Show Import Options, you have the option to place individual pages or ranges of pages, and choose how they will be cropped.

After placing, you can crop the PDF pages in InDesign by dragging the bounding box handles (the handles which surround the PDF, which is treated like a graphic).

After placing and cropping your PDFs, choose File > Export > Adobe PDF (in CS5 or 6, choose File > Export > Adobe PDF (Print) to create a new PDF. You can choose between different PDF presets. Consult InDesign Help for more information or ask in the InDesign forum.