how to use the split line feature on this complex sketch?

Hello, i have the profile of this chair and i am trying to apply the split line feature or the project curve feature on it, based on 2d drawing imported from autocad. But i have a problem on how to aproch this feature in this situation, can someone help, please? thank you

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I guess you cannot use this sketch because it cannot split a surface all at once. You should try doing it in smaller steps using parts of the original sketch each time. If I have time tomorrow I will try it for you.
Good luck

Ps. Inspire you should not delete your answer. I always benefit from your answers and learn things I do not know.

 
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