Hello Filip,
One thing you might consider is to locate the Help articles shown in the image below and try a number of different available options for importing geometry into MAPDL: 
If you have an .anf file, I think all you need to do is to read it into MAPDL with the /input command:
/aux15
/input,filename,anf
The following Help article describes .anf file contents/format:
but I don't see the simple instructions regarding how to read it in. So I'm not 100% certain, but I suspect what I have above is correct.
Kind regards,
Bill
You are navigating away from the AIS Discovery experience