The easiest way is to simply use the import / import from file within the Rocksmith DLC builder or Toolkit and select the dlc file which will let you just select the tones you wish you import.
Otherwise you can assign that tone within Rocksmith and use a similar feature to import from your Rocksmith profile which will let you access your hotkeyed tones.
Finally, if all else fails you essentially just go into tone designer and write down all the information of the tone and then create/add a new tone in the builder/toolkit and fill that same info manually.
Also, if you have trouble finding the ODLC file itself (the naming convention is somtimes strange) the best way I found is to go into your Steam DLC for Rocksmith, uninstall and reinstall it so that when you sort by newest that DLC will be on top.
peonmypeon's post in ELI5 - take ODLC tone for Miserlou and use it for Dick Dale CDLC was marked as the answer