There is no manual or instructional guide on how to add a company or a customer in that application. I've searched the web and I couldn't find anything about it. If you have it installed, access the built-in Help section. For an application of this type, I am absolutely sure there should be a manual presenting you the ways to add a contractor.
There is no data on the official website as well, therefore send an inquiry to the developers about this: http://viewpoint.com/contact-us