Copying, cutting and pasting files and folders is basically possible within ISO or Multisession compilations. However you should be aware of a number of constraints which are due to the nature of Multisession compilations.
If you want to continue a Multisession CD which was not compiled with Nero and/or which was created on another PC, then Nero cannot automatically update the compilations as it does not know the positions of the files on the hard disk. Of the displayed files, Nero only knows their size and position on the reference CD. If such an entry were now copied and pasted to another 'normal' ISO compilation, the file could not be correctly burned later on because Nero does not know what is in it and does not know whether the file is on the hard disk, and if it is, where it is.
To prevent such problems occurring when burning, Nero displays an error message when such an attempt at pasting is made, and refuses to carry out the operation. Similar problems would of course also occur when transferring files from one Multisession document to another.
You should therefore be clear in your mind that when handling Multisession compilations you are often not dealing with data that are directly accessible, and that as a result there are certain limitations in regard to convenience as compared with ISO compilations that have to be remembered.