Not sure what you mean by 'inviolacy'. But (assuming I understand what youre asking) If Im doing that I would just drag and drop the original 12 minute recording onto one track and then duplicate it to another.
I would then use the original as a reference and use the duplicate for chopping up. (Audio editing is non destructive in Logic)
Peter, is your performance MIDI or audio? Either way, Stephe's strategy is good, but if it's an audio recording, you may want to perform a "Convert Regions to New Audio Files" from the Audio menu in the Arrange window. There are some audio processes that are destructive, like Time Machine functions.