Hi billbennettnz,
Welcome to the Support Communities!
The article below may be able to help you with this. Click on the link to see more details and screenshots.
Boot Camp Help: Install Windows on your Mac
https://help.apple.com/bootcamp/mac/5.0/help/#apdecf0e4b6-b472-438d-881e-57c230b 1c250
Boot Camp 5.1: Frequently asked questions
http://support.apple.com/kb/HT5639
Can I use a downloaded (ISO) version of Windows with Boot Camp?
MacBook Air (Mid 2011 and later), MacBook Pro (Mid 2012 and later, including Retina models), Mac mini (Mid 2011 and later), and iMac (Late 2012) can install downloaded (ISO) versions of Windows 7 and 8.
To determine if your Mac supports this feature:
- Click the Go menu and choose Utilities.
- Open Boot Camp Assistant.
- Click Continue. If you see a "Create a Windows 7 or later install disk" checkbox, your Mac supports the use of downloaded (ISO) install images. See the Boot Camp Installation & Setup Guide for more information.
I hope this information helps ....
- Judy