depends on exactly what you want to do, ill presume you want an exact copy on another disk but only have 1 cd drive. so 1st you copy the cd by clicking on the cd you want to copy, going to new image(on the graphical menu on the top of the window), select the options (id would use read only or cd master). after it has finished doing that(may take a while depending on the computer you use), you should see a .cdr or .dmg or .iso as the selection on the left bar, click Burn and insert the blank cd. this should work
There is a GREAT program called toast titanium that lets you do this in just one step: Copy the disc then put in a blank on and burn.
Toast it a great piece of software that lets you do all kinds of kewl stuff with it. Its a little expensive but its a very powerfull burning utility.
You may be able to find the older version: Toast 6