3D Poling of Piezo Bowl

Hi There,

A few years ago I posted this: https://support.onscale.com/hc/en-us/community/posts/360008590497-3D-Curved-Ceramic-Poling

I am now revisiting the model and I have imported a CAD model of a 3d bowl where each piezo segment is it's own part (as suggested in the previous forum question). I am stuck on how I define the poling axis for each of the piezo parts (it would be way too complicated to define a local coordinate system/axis for each). Is there a specific command I can use for this?

Thanks

Laura