Struggling to use Bezier curves

[brandy20]

Hi everybody, I have a little problem in using Bezier curves. I understand the meaning of their use but when I draw a curve on a solid and, for example, I start from a corner, I can't end it making an inference on the opposite edge of the solid. Take a look to the attached file to better understand. Thanks!

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[Dave R]

I'm going to send you an e-mail about this.

Dave