Currently an opening in a Template is created in rectangular form and adding odd shapes in templates is planned in a future ProSelect release.

However you can create a template displaying an oval opening (for example) by using an Overlay Image, a feature built into the ProSelect Template Editor.  This ability allows the use of Photoshop templates within the program and is automatically carried through to High-Res Production also.

Please see this article "Using Photoshop Templates in ProSelect" for more information.