Hello TomM6,
Unfortunately there is no option to automatically suspend a virtual Machine through Parallels Desktop configuration.
In order to suspend a virtual machine, you will have to do one of the following procedure manually every time :
* Choose Suspend from the Actions menu
Or
* Click the Suspend button in the Parallels Desktop toolbar.
Or
* Click close button from top left hand corner.
If you would like to automatically suspend your virtual machine using Windows power-saving feature, you can try
Windows 10 hibernation option.
Another piece of information - Pausing a
virtual machine is quite efficient because the resume process takes less time comparing to suspending, as the virtual machine's process is already running and guest RAM is loaded. Additionally you have the option to pause the virtual machine automatically when window is not active for more than 30 seconds.
Check this article for more information about Suspend and Pause operations in Parallels Desktop virtual machine.
Thanks,
Dhana.