Within SuiteDash, you have the option to sync Estimates and Invoices created within your Billing menu with your QuickBooks Online account. You can link your QuickBooks Online account to your SuiteDash account by navigating to Settings–>My Account–>Integrations and clicking the "Connect to QuickBooks" button.
From there, a new window will open, prompting you to login with your QuickBooks Online credentials, and ask you to confirm connection between QuickBooks Online and SuiteDash.
Once connected, all Estimates and Invoices that are created within SuiteDash will be automatically created in your QuickBooks Online account as well. Additionally, any Invoice payments that are tracked inside SuiteDash will be reflected in your payment history of your QuickBooks Online account.