Account groups can be created to organize your accounts hierarchically.
Choose Account>New Account Group, or click the button below the source list and choose "New Account Group." Enter a name for the group in the sheet that appears and click "Create Account Group" to add it to the source list. Use drag & drop to move accounts in and out of the group. Click the small disclosure triangle next to the group's icon to hide or display the accounts within.
The amount that displays below the group's name represents the total balance of all the accounts within. Selecting the account group itself will display transactions from all the enclosed accounts in the transaction view to the right. Transactions cannot be added or removed when a group is selected, but any changes made in list view will be applied to the transactions in their original accounts.
Select the group in the source list and press the 'Delete' key on your keyboard, or choose Edit>Delete. A sheet will appear asking you to confirm that you want to permanently delete the group. All accounts contained within the group will also be deleted. To remove accounts from the group before deleting it, drag and drop them to another location in the source list.