Hello Jay21.
Just to let you know that apart from using Drum VSTs, I almost exclusively work with hardware synths so I use the instrument definition INS files all the time. The guys here have already given you instructions on how to import them but if for example some of your older gear, like some of my stuff, doesn't have an INS file, you can create your own by editing an existing one, using it like a template.
What I did to import the preset names into the INS file was to take a copy of the patch list from the unit's instruction manual (from a PDF), paste it to Notepad, tidy it up & then paste that into a blank INS which I then customised for my instrument.
Somewhere in the Sonar installation disks are additional INS files. In fact if my memory serves me right, they get installed somewhere on your disk drive so have a hunt round.
Also, this was the link I used when I wanted to find out more about using INS files:
https://www.cakewalk.com/Support/kb/reader.aspx/2007013272 I think you'll find it contains all the info you'll need plus it has links to some additional INS files.
Good luck!