Reply To: Modeling a WR-90 waveguide with one open end embedded in an infinite PEC ground

[Praneeth]

Please provide snap shots of how you are defining the model as Ansys employees cannot access attachments across the forum.
Providing snap shots will help to understand your concern more effectively.
Regarding the second part of the question, you can use Relative co-ordinate system while defining your model.
All the very best.