Congratulations, Shelly! Have fun with your new CAD program. "Boolean operations use two or more existing 2D objects to create a new object. Objects can be combined, subtracted, and intersected." So, two squares placed next to each other make a rectangle for instance.
http://www.kxcad.net/imsi/TurboCAD/t...operations.htm Not sure if this covers your version of the program or not, but it should be close.