Hi Michael,

The robust & intuitive nature of MoI always yields some urge and curiosity in me to explore workarounds for problems like this. I often think: "What if I can do them all in MoI, even if it's time-consuming?". But I guess I was trying to do the impossible here. Just want to let you know how much I love MoI.

Maybe for now I should avoid constructing these kinds of curve combination from the first place, if I'm determined to use MoI exclusively.

XNURBS looks very promising, but it's quite expensive.

Thank you very much!
I really appreciate your help and suggestions.