First of all, why do you prefer to use DesignModeler? Ansys provides now new softwares like Ansys Discovery or Ansys SpaceClaim who can provide you best tools to create your geometry.
Can you share a picture of the final application you want to recrate. My suggestion is to use a sketch approach with splines to create your profiles. If manually you cannot create it, there is also the chanche to use script to generate your model.
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Luca
You are navigating away from the AIS Discovery experience