That functionality is not available in Track-It! 11.4. If you upgrade to Track-It! 2019, you will then be able to add Patch Management licenses to the Client Management module if you want to use that feature.
Many Thanks for the Info. We will upgrade to track-It! 2019.
Make sure to check out all the info though. Track-It! 2019 does not have all the modules 11.x had so you may need to wait to upgrade if you rely heavily on modules not yet in 2019. You can view the list here https://docs.bmc.com/docs/trackit2019/en/track-it-11-x-vs-track-it-20xx-852580873.html