How to split curved solid into two parts


Here is the way to do it:
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Step 1:
1 Create a surface fill using the 3d sketch as patch boundary. Uncheck optimize surface.
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Step 2:
2. Do a split using the surface as trim tool. Check all bodies and press cut bodies. Check the first body on the list bellow an double click on "none". A window will open for you to save a derived part from the first body. Then check the second body and save a second part.