I found on my hard disk a video from December 2017. It explains how to build Multitools in Teamcenter Resource Manager and how to retrieve and use them in NX CAM. Starting with Teamcenter 11.5 and NX 12.0.2 this functionality is available. The video is still true and valid.
Perhaps the "walk through" is interesting and useful for you, as well?!?
Here are a few markers that allow you to jump directly to the corresponding chapter:
Part 1 Intro (02:14) 00:00 Explain different Multitool Types