LogMeIn Central does not support the ability to create groups within groups (often referred to as 'Nested Grouping') at this time. However, LogMeIn Central does offer the ability to perform a search for computers on your account using specific keywords, and then save those searches for future reference. To do this, follow the steps below:
Log in to your account using your LogMeIn ID (email address) and password at LogMeIn.com.
On the Home page, type the keywords into the Search box.
Once the keywords have been entered, click the link "Add this search to favorites".
Once your search terms are saved, you can click the arrow in the Search field and select one of your Saved Searches to bring up each of the computer on the account that meet the keyword criteria.