Hello, Niknic.
QuickBooks relies on the apps available on the Find Apps page. If you haven't found a suitable app but are already using a third-party application linked with QBO, ask your POS system support for help to see if they allow you to import sales from delivery services like GrubHub.
Furthermore, to effectively manage your sales and monitor financial data, you can use this article for guidance: Run reports in QuickBooks Online.
Our community is an open space for you, drop a reply if you have further questions about third-party apps. Take care.
