I don´t have Creo 3, but it seems that you can do it with freestyle:
And a member of our community has a good tutorial about surfaces of that kind: here.
I did an N-Sided patch and think it turned out pretty well. Haven't done one of those in forever. Don't have the "Style" extension.
As always, it depends on EXACTLY the geometry you want. There are any number of ways to do this, and they all produce different geometry. Doing it with a "triangular" flat is easier and less CPU/data storage intensive....it also doesn't "blend" anything, it's just a flat and toroidial surfaces. I liked the N-sided patch better, personally. But, here's an easier/much less features way to do what you did. No reason to creat boundary blends if you don't need them, these are simple toroidial surfaces.
Wow, nice work! I can't wait for Pro/E to simply just be able to DO that without having to build things so elaborately.
Glad I don't have to worry about that, I know the guy polishing the mold will make everything C2 as long as I get it as close as possible. 
I worked on a couple of ID projects and they really wanted the model -perfect- since it makes the EDM forms. Any glitch in the model will reflect in the mold.
In general I agree; sandpaper is the best C2 tool ever made. Maybe we need a sandpaper feature!
Muster. You have to pass muster. Military term. First formation of the day. You don't pass muster, you in a heap o' trouble. The start of what will probably be a very bad day.
Passing mustard is a whole different thing.
...especially if it's SPICY mustard....
Ok, back on target. I just made 3 solid tubes that connected, and used a D1xD2 C2 round, tweaking the size and shape factor:
