question

The idea is to locate the samples for soft synths on a drive separate from your audio recording/playback drive (and/or O/S and application drives) since they can take up a lot of room, and if the synth uses direct streaming of samples from disk, having separate audio and sample storage drives gives each function more data bandwidth for real-time audio streaming.

It is not necessary or desirable to separate the actual DLL files for the plug-in from the drive that hosts the SONAR application. Most plug-in installers should give you an option to install samples to a different drive, while the plug-in DLL and supporting files are installed to the default directory on your application drive.

That said, I could be wrong, but I think it's probably not desirable to put samples on a networked drive, as you're unlikely to get any performance gain from streaming samples over a network connection vs. off of a local drive, even if that drive is not dedicated to samples.

And finally, customizing plug-in layouts is done from Tools > Plug-in Manager, which I believe is included with all versions.

i would like to install sonar on a computer, and all my vst onto another networked computer

That was actually common practice at one time, especially among folks doing heavy-duty orchestration, but it's less common nowadays. The idea is not to install your VSTs on a remote drive, as that buys you nothing, but rather to RUN your vsts on another computer. That does work well and is easy to set up.