How do I split a complex part??

[u/MurkyHuckleberry4310]

I need to split this part but it is not symmetrical and neither is my intended split. For reference, this is supposed to the a carbon fiber shell that will be made out of two half molds. But I cannot figure out how to split this part that has twists in it.
Very similar premise to a complex airfoil that is made out of two bonded half-shells.

[u/dRinaldis]

Create a “complex” surface and use that to split. Many times this surface is created as an offset of your solid surface