Hello Valeria,

Your original question was how to construct a hyperbola curve in SpaceClaim. I did some research and found that Equation driven curves were added to SpaceClaim in 2016.  See the Sigma button in the toolbar?  What version of ANSYS are you using?

Unfortunately, they don't allow [C] to be used in the End definition, so you would have to do some construction to trim off an excess length.

I don't yet know if these parameters can be used by Workbench to update geometry during a Design Optimization.

Attached is an ANSYS 19.1 SpaceClaim file.