Renaming targets is completely possible in PingPlotter Pro, and this *will* be a built-in feature in the upcoming v4 release. In the meantime, if you're using the current 3.43.3p version - you'd just need to utilize an extension to accomplish this. You can find this extension (as well as some instructions on how to install and use it) here: https://www.pingman.com/forums/ubbthreads.php/topics/2040/Extension:_Allow_renaming_of_h#Post2040
Hopefully this helps out! Please let us know if you have any questions.