If you want to copy from one CD and then you want to paste it to the other CD, you must have a CD R/W. Then you can do that. Then you've to insert the both CDs and copy from one CD to another. It is called CD writing.
Well first of all you make sure that you have a CD Writer. First put the CD from which you want to copy and copy the required file to the Hard Drive of your computer. Now put a writeable CD in your CD writer and burn that file into the Writeable CD either by usin NERO (the recognized software for writing/burning the CDs) or you can use any other burning software.