This is not a critical situation, but would eliminate some steps. Refer to picture attached.
Firstly I'd like to combine curve 1 and 2 to create the 3d composite curve 3, at the moment I use boolean intersect then copy the edge of the resultant edge to get my curve. Just wondering (Michael) if there could be a simpler way, a script maybe which will do it in one step without having to delete surfaces afterwards ?
There is a number of ways I can do this using extrude then intersect curve or boolean merge works as well.

Cheers
~Danny~