By default app will generate four primary group such as liabilities, assets, incomes and expenses with four temp ledgers for each. User can structurize the list of main group , sub groups and ledgers by clicking add button. The tree view of ledgers can be created in the Chart of Accounts.
The add button will be pop up while cursor over the primary groups.
To check this at demo.onclouderp.com > Account > Setup > Chart of Accounts