There is another way to set up your accounts. I will try and describe it from memory, and will verify my description tomorrow. The procedure is:

Open the Account Group and Chart of Account views, and position them side-by-side. You can then drag-and-drop the specific accounts you need into the various ranges. By drag and drop, I mean to left-click on an account (you can use shift-click to select a range of accounts). Then, holding down the left mouse button, drag the cursor over to the Account Group View and release the left mouse button when the account range you are trying to add the acocunts to is selected.