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Thanks Neil, I wasn't aware of the Network license. It may have been mentioned when I first purchased Mathematica, several years ago now. But if the cost was hugely inflated, which is usually the case with network licenses, I would have moved on...
This is not a very clear question, but maybe you have in mind to work with Bezier-type surfaces? If so, such things are supported in Mathematica.
Thanks. I'll try to solve it.
It is good to modify it as you have told me. Thank you !