1. I select the curve which is a sketch (turns red) Then
I am guessing here, reselect with RMB, and a section
of the curve will turn Blue and select (the Blue portion)
LMB>Shift and select your other curve sections that will
make up you Composite Curve. As you select the
curve sections they will turn into a thick Red color.
2. I press ctrl c
3. I press ctrl V
4. I was able to get it to come up with the
exact/approximate menu once but I don't know what
I did.
Hope this helps