Thank you for your post. There is a feature in our 9.3 build that will allow you to search a machine name and find what Machine groups it is associated with. To do this, you will right-click on a Machine group, and you'll see an option to 'Search machine groups' .
You'll then get a search box, where you can enter the machine name you're looking for, and it will tell you the groups it is located in. Example of this below.
That's great. Thanks for the quick response. Exactly what we were looking for.