OK, we can't comment much further via the Community as it counts as "public" from an Export Law point of view: I can give pointers but with UDFs that may not be enough. This platform was initially intended for Academic usage and is currently evolving to include anyone who wants a "simple but quick" answer.
However, with paid software you should have some level of support (my main task within Ansys is commercial customer support), and given you're a CADFEM customer I'd contact them. There should have been some information given at the time of purchase but from experience I know that can finish up with your company accounts group! Note, UDFs tend to fall slightly outside of the general support so their input may be limited.
You are navigating away from the AIS Discovery experience