Hello, how do you make a local cut on a 2D part, drawing, on CATIA V5? thank you in advance

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This is a level that I designed on the CATIA V5 software and  on which I would like to make a local cut on the part indicated  in the square of the drawing given attached on the word document. Thank you in advance if someone can inform me, it's nice of him!


coupe_locale_catia_v5.docx
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Hello it's a bit old but in case you haven't found it: