Couple of questions

 From:  motorsep
1. There are some nice tools in Rhino such as Project Curve to Surface, Duplicate Edge and Duplicate Border.
What is the alternative to that in Moi3D ?
2. I created couple of shapes with Polyline tool and couple of circles with Circle tool. Now I want to "weld" them in one shape. So I
do Boolean->Union and nothing happen :/ Is it because Boolean work only with surfaces/enclosed volumes?