It is possible to copy or move tracks from one CD compilation window to another and even inside the same window. Some restrictions apply, however. It is not possible to drag a folder/directory into an audio section, and you cannot drag a CD track to a data section. Within the same compilation window only the 'Move' operation is allowed, but no copying.
To move a track from one CD compilation window to another you simple use the drag-and-drop functionality. You don't have to press any modifier key. It's as simple as that.
You can as well use the 'Cut' and 'Paste' functions from the menu to accomplish that.
To copy a track from one CD compilation window to another you use the drag-and-drop functionality. You will have to press the 'Option/Alternate' key, which designates a 'Copy' operation. It's as simple as that.
You can as well use the 'Copy' and 'Paste' functions from the menu to accomplish that.